fix(ci): remove actions/cache step that requires Node.js

- Gitea runner doesn't have Node.js installed
- actions/cache@v4 requires Node.js runtime
- vendor/ caching handled by runner workspace persistence

.gitea/workflows/ci.yml

@@ -74,21 +74,8 @@ jobs:
 
           cd /workspace/repo
 
-      - name: Get Composer cache directory
-        id: composer-cache
-        shell: bash
-        run: |
-          echo "dir=$(composer global config cache-dir 2>/dev/null | cut -d' ' -f3 || echo "$HOME/.composer/cache")" >> $GITHUB_OUTPUT
-
-      - name: Cache Composer dependencies
-        uses: actions/cache@v4
-        with:
-          path: |
-            ${{ steps.composer-cache.outputs.dir }}
-            vendor/
-          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-composer-
+      # Note: Composer caching via actions/cache@v4 requires Node.js in runner
+      # Skipped for now - vendor/ is cached in runner workspace
 
       - name: Install PHP dependencies
         run: |