ci: Add verification test for bootstrap fix (issue #8837)

Add a CI check to verify that locale files are successfully copied during
the build phase without relying on the system install command. This test
ensures the bootstrap issue doesn't regress.

The test verifies:
- Locales directory is created
- Common uucore locales are copied
- Utility-specific locales are copied
- A reasonable number of locale files exist (>50)

This addresses the maintainer request to add a regression test for the fix.

Author: naoNao89

.github/workflows/CICD.yml

@@ -293,6 +293,30 @@ jobs:
         test -f target/CACHEDIR.TAG
         # Restore cache for target/release (we only did a debug build)
         mv -t target/ target.cache/release 2>/dev/null || true
+    - name: "Verify bootstrap fix (issue #8837)"
+      shell: bash
+      run: |
+        set -x
+        # Verify that locales were successfully copied during build
+        # This ensures the bootstrap issue is fixed - the build should work
+        # even without relying on system 'install' command
+        
+        echo "Checking that locale files were copied to build directory..."
+        test -d target/debug/locales || { echo "::error ::Locales directory not created"; exit 1; }
+        
+        # Check for uucore common locales
+        test -f target/debug/locales/uucore/fr-FR.ftl || { echo "::error ::uucore locale not copied"; exit 1; }
+        
+        # Check for at least a few utility-specific locales
+        test -f target/debug/locales/ls/fr-FR.ftl || { echo "::error ::ls locale not copied"; exit 1; }
+        test -f target/debug/locales/cat/fr-FR.ftl || { echo "::error ::cat locale not copied"; exit 1; }
+        
+        # Count total locale files to ensure reasonable number were copied
+        LOCALE_COUNT=$(find target/debug/locales -name "*.ftl" | wc -l)
+        echo "Found $LOCALE_COUNT locale files"
+        [ "$LOCALE_COUNT" -gt 50 ] || { echo "::error ::Too few locale files copied ($LOCALE_COUNT)"; exit 1; }
+        
+        echo "Bootstrap fix verified: locales copied successfully without system install"
     - name: "`make nextest`"
       shell: bash
       run: make nextest CARGOFLAGS="--profile ci --hide-progress-bar"