CI: force LANG/LC_ALL to UTF-8 in iOS workflows (CocoaPods needs it)

pod install fails with Encoding::CompatibilityError 'Unicode
Normalization not appropriate for ASCII-8BIT' when the shell locale
isn't UTF-8. CocoaPods' own warning tells you: 'CocoaPods requires
your terminal to be using UTF-8 encoding'.

Gitea Actions runner on macOS launches subprocesses with LANG unset,
which Ruby treats as ASCII-8BIT. Setting env-level LANG=en_US.UTF-8
and LC_ALL=en_US.UTF-8 fixes it for all steps in the job.

.github/workflows/build-ios-sim.yml

@@ -28,6 +28,10 @@ jobs:
     env:
       APP_IOS_TYPE: cakewallet
       BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
+      # CocoaPods refuses to operate when LANG is ASCII-8BIT (default for the
+      # Gitea runner shell). Force UTF-8 globally so `pod install` succeeds.
+      LANG: en_US.UTF-8
+      LC_ALL: en_US.UTF-8
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/build-ios-testflight.yml

@@ -35,6 +35,9 @@ jobs:
     env:
       APP_IOS_TYPE: cakewallet
       BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
+      # CocoaPods needs UTF-8; Gitea runner shell defaults to ASCII-8BIT.
+      LANG: en_US.UTF-8
+      LC_ALL: en_US.UTF-8
 
     steps:
       - uses: actions/checkout@v4