fix: linux CI, strip inner wrapper dir from monero_c RC2 bundle (#3325)

.github/workflows/pr_test_build_linux.yml

@@ -116,10 +116,18 @@ jobs:
           ./scripts/prepare_moneroc.sh
           mkdir -p scripts/monero_c/release
           pushd scripts/monero_c/release
-            mkdir -p $(git describe --tags)
-            pushd $(git describe --tags)
+            TAG=$(git describe --tags)
+            mkdir -p "$TAG"
+            pushd "$TAG"
               wget https://github.com/MrCyjaneK/monero_c/releases/download/v0.18.4.6-RC2/release-bundle.zip
               unzip release-bundle.zip
+              # RC2's bundle puts everything under an inner v0.18.4.6-*/ dir, strip it
+              shopt -s nullglob
+              for inner in v0.18.4.6-*/; do
+                mv "$inner"* .
+                rmdir "$inner"
+              done
+              shopt -u nullglob
               rm release-bundle.zip
             popd
           popd