ci(gitea): move the Windows build and signing off GitHub

Gitea is master and GitHub is a mirror, but the Windows and Linux jobs still
only existed in .github/workflows, so GitHub was doing real build work. This
moves Windows.

Two jobs on two machines, which is the point rather than an accident:

  build  runs on `deb` (windows-latest:host — it carries the MinGW
         cross-compiler) and produces an unsigned wowlet.exe.
  sign   runs on desktop-iim2fs2 (windows:host), the machine with the EV
         code-signing token physically in it.

The signing job does not itself sign. Its runner is NT SERVICE\act_runner,
which cannot use the token: SafeNet holds the login per user and the login is
established interactively by an operator. So the job queues the binary for the
Fleet-installed broker (roles/windows_code_signing) and waits. CI never holds
the key and never holds the token password, so it cannot spend one of the
token's three password attempts.

Differences from the GitHub lane, all because this is a real fleet host rather
than a disposable hosted runner:

- No apt install and no sudo. Every dependency is already present on deb, and a
  first step asserts the toolchain — including that mingw is the posix
  threading variant — and fails pointing at such-fleet rather than half
  building.
- No disk-freeing or fallocated swap. Those existed to survive a hosted
  runner's 16G/14G budget; deb has 30G and 3.1T free.
- depends builds at -j4 and wowlet at -j6 rather than -j2 for the same reason.

The exe is staged unzipped between the jobs because the broker signs one PE at
a time; the published zip is assembled after signing, so the archive contains
the signed binary. The signature, its RFC 3161 timestamp and the expected
signer are all re-verified on the artifact that actually ships.

Dispatch-only: both runners are capacity 1 and shared with other lanes.

.gitea/workflows/build-windows.yml

@@ -0,0 +1,216 @@
+name: windows build + sign (gitea self-hosted)
+
+# Runs ONLY on Gitea (GitHub ignores .gitea/workflows), in the private Builds
+# repository. Gitea is master; GitHub is a mirror and a release surface.
+#
+# Two jobs on two different machines, and that split is the whole point:
+#
+#   build  -> `deb`, which advertises windows-latest:host because it carries the
+#             MinGW cross-compiler. Produces an UNSIGNED wowlet.exe.
+#   sign   -> `desktop-iim2fs2` (windows:host), the only machine with the EV
+#             code-signing token plugged into it.
+#
+# The signing host does not sign in this job. The runner there is
+# NT SERVICE\act_runner, which cannot use the token: SafeNet holds the token
+# login per user, and the login is established interactively by an operator.
+# So the job queues the artifact for the signing broker that Fleet installs
+# (roles/windows_code_signing) and waits for it. CI never sees the key and never
+# sees the token password, so it can never spend one of the token's three
+# password attempts.
+#
+# Dispatch-only. Both runners are capacity 1 and shared with other lanes.
+
+on: [workflow_dispatch]
+
+env:
+  HOST: x86_64-w64-mingw32
+
+jobs:
+  build:
+    name: "Windows x86_64 (mingw cross, depends)"
+    runs-on: windows-latest      # gitea label windows-latest:host -> deb, host mode
+    steps:
+      - name: verify the cross toolchain is present
+        # Host mode on a shared fleet runner: this job installs nothing and
+        # needs no sudo. Fleet owns the toolchain; if something is missing the
+        # job says exactly what rather than half-building.
+        run: |
+          missing=0
+          for t in curl bzip2 unzip zip git cmake make ccache python3 perl pkg-config \
+                   x86_64-w64-mingw32-gcc-posix x86_64-w64-mingw32-g++-posix; do
+            command -v "$t" >/dev/null || { echo "MISSING: $t"; missing=1; }
+          done
+          # mingw32.mk needs the posix threading variant (std::thread/mutex/cv).
+          x86_64-w64-mingw32-g++ -v 2>&1 | grep -q 'Thread model: posix' || {
+            echo "MISSING: x86_64-w64-mingw32-g++ is not the posix threading variant"; missing=1; }
+          [ "$missing" = 0 ] || { echo "Fix the build host in such-fleet, not here."; exit 1; }
+          echo "toolchain ok"; nproc; free -g | head -2
+
+      - name: configure git
+        run: git config --global --add safe.directory '*'
+
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      # depends is the slow part (static Qt6/boost/openssl/tor from source).
+      # Cache the source tarballs and the compiled packages so only a cold run
+      # pays the ~1h cost.
+      - name: restore depends sources cache
+        id: cache-sources
+        uses: actions/cache/restore@v4
+        with:
+          path: contrib/depends/sources
+          key: depends-sources-${{ hashFiles('contrib/depends/packages/*') }}
+          restore-keys: |
+            depends-sources-
+
+      - name: restore depends built cache (mingw)
+        id: cache-built
+        uses: actions/cache/restore@v4
+        with:
+          path: contrib/depends/built
+          key: depends-built-mingw32-${{ hashFiles('contrib/depends/packages/*', 'contrib/depends/hosts/*', 'contrib/depends/toolchain.cmake.in') }}
+          restore-keys: |
+            depends-built-mingw32-
+
+      - name: build depends (static Qt6 + tor + boost + openssl for mingw)
+        # -j4, not the -j2 the GitHub lane needs: that limit existed because a
+        # parallel static Qt6 compile OOMs a 16G hosted runner. deb has 30G.
+        run: make -C contrib/depends HOST="$HOST" -j4
+
+      # Save with if:always() so an expensive toolchain banks even when the
+      # later wowlet.exe build fails; the automatic post-save is skipped on
+      # job failure, which otherwise re-pays hours every time.
+      - name: save depends sources cache
+        if: always() && steps.cache-sources.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v4
+        with:
+          path: contrib/depends/sources
+          key: depends-sources-${{ hashFiles('contrib/depends/packages/*') }}
+
+      - name: save depends built cache (mingw)
+        if: always() && steps.cache-built.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v4
+        with:
+          path: contrib/depends/built
+          key: depends-built-mingw32-${{ hashFiles('contrib/depends/packages/*', 'contrib/depends/hosts/*', 'contrib/depends/toolchain.cmake.in') }}
+
+      - name: fetch wownerod.exe to embed
+        run: |
+          rm -rf /tmp/wownerod-embed && mkdir -p /tmp/wownerod-embed
+          curl -fL -o /tmp/wownero-win.zip \
+            https://github.com/wownero/wownero-codeberg-mirror/releases/download/v0.11.4.0/wownero-x86_64-w64-mingw32-v0.11.4.0.zip
+          # -j flattens the versioned subdir so wownerod.exe is a DIRECT child
+          # (WownerodQrcGenerator globs ${WOWNEROD_DIR}/* non-recursively).
+          unzip -o -j /tmp/wownero-win.zip 'wownero-x86_64-w64-mingw32-v0.11.4.0/wownerod.exe' -d /tmp/wownerod-embed
+          ls -la /tmp/wownerod-embed
+
+      - name: build wowlet.exe
+        run: |
+          rm -rf build && mkdir build && cd build
+          # ARCH=x86-64: portable baseline. wownero's CMake defaults ARCH=native,
+          # which under a cross compiler bakes the BUILD HOST's instructions into
+          # the Windows binary -> SIGILL on older CPUs.
+          cmake --toolchain "$GITHUB_WORKSPACE/contrib/depends/$HOST/share/toolchain.cmake" \
+            -DARCH=x86-64 \
+            -DWITH_SCANNER=OFF \
+            -DCHECK_UPDATES=OFF \
+            -DTOR_INSTALLED=On \
+            -DFEATHER_TARGET_TRIPLET="$HOST" \
+            -DWOWNEROD_DIR=/tmp/wownerod-embed \
+            ..
+          cmake --build . -j6
+          ls -la bin/
+
+      - name: stage the unsigned exe for signing
+        # The signing job needs the bare exe, not the zip: the broker signs one
+        # PE file at a time. The zip is assembled after signing so the published
+        # archive contains the signed binary.
+        run: |
+          mkdir -p stage/tor
+          cp build/bin/feather.exe stage/wowlet.exe
+          cp "contrib/depends/$HOST/Tor/tor.exe" stage/tor/tor.exe
+          (cp LICENSE stage/LICENSE.txt 2>/dev/null || cp COPYING stage/LICENSE.txt 2>/dev/null) || true
+          ls -la stage stage/tor
+
+      - name: upload unsigned staging tree
+        uses: actions/upload-artifact@v4
+        with:
+          name: wowlet-x86_64-windows-unsigned
+          path: stage/
+          if-no-files-found: error
+
+  sign:
+    name: "Authenticode sign (hardware token broker)"
+    needs: build
+    runs-on: windows             # gitea label windows:host -> desktop-iim2fs2
+    steps:
+      - name: download unsigned staging tree
+        uses: actions/download-artifact@v4
+        with:
+          name: wowlet-x86_64-windows-unsigned
+          path: stage
+
+      - name: queue wowlet.exe for the signing broker and wait
+        shell: powershell
+        run: |
+          $ErrorActionPreference = 'Stop'
+          $queued = "wowlet-${env:GITHUB_RUN_ID}.exe"
+          $inPath  = "C:\signing\in\$queued"
+          $outPath = "C:\signing\out\$queued"
+
+          if (Test-Path 'C:\signing\SIGNING_LOCKED') {
+            Get-Content 'C:\signing\SIGNING_LOCKED'
+            throw "The signing broker's circuit breaker is tripped. An operator must clear it."
+          }
+
+          Copy-Item 'stage\wowlet.exe' $inPath -Force
+          Set-Content -LiteralPath "$inPath.ready" -Value $env:GITHUB_RUN_ID
+          Write-Host "queued $queued"
+
+          $deadline = (Get-Date).AddMinutes(10)
+          while ((Get-Date) -lt $deadline) {
+            if (Test-Path "$outPath.done") { break }
+            if (Test-Path 'C:\signing\SIGNING_LOCKED') {
+              Get-Content 'C:\signing\SIGNING_LOCKED'
+              throw "The broker tripped its circuit breaker while signing this artifact."
+            }
+            Start-Sleep -Seconds 5
+          }
+          if (-not (Test-Path "$outPath.done")) { throw "Timed out waiting for the signing broker." }
+
+          Move-Item $outPath 'stage\wowlet.exe' -Force
+          Remove-Item "$outPath.done" -Force -ErrorAction SilentlyContinue
+
+      - name: verify the published binary is signed and timestamped
+        # The broker verifies before releasing; this verifies again on the
+        # artifact that is actually about to ship. A signature or timestamp
+        # failure blocks distribution.
+        shell: powershell
+        run: |
+          $ErrorActionPreference = 'Stop'
+          $sig = Get-AuthenticodeSignature 'stage\wowlet.exe'
+          $sig | Format-List Status, StatusMessage,
+            @{n='Signer';e={$_.SignerCertificate.Subject}},
+            @{n='TimeStamper';e={$_.TimeStamperCertificate.Subject}}
+          if ($sig.Status -ne 'Valid') { throw "Authenticode status is $($sig.Status)" }
+          if (-not $sig.TimeStamperCertificate) { throw "Signature carries no RFC 3161 timestamp" }
+          if ($sig.SignerCertificate.Subject -notmatch 'Such Software LLC') {
+            throw "Unexpected signer: $($sig.SignerCertificate.Subject)"
+          }
+          Write-Host "SHA256 $((Get-FileHash 'stage\wowlet.exe' -Algorithm SHA256).Hash)"
+
+      - name: package the signed zip
+        shell: powershell
+        run: |
+          $ErrorActionPreference = 'Stop'
+          Compress-Archive -Path 'stage\*' -DestinationPath 'wowlet-x86_64-windows.zip' -Force
+          Get-ChildItem 'wowlet-x86_64-windows.zip' | Format-List Name, Length
+
+      - name: upload signed Windows zip
+        uses: actions/upload-artifact@v4
+        with:
+          name: wowlet-x86_64-windows
+          path: wowlet-x86_64-windows.zip
+          if-no-files-found: error