use custom image

.forgejo/workflows/test.yml

@@ -3,28 +3,20 @@ jobs:
   test:
     runs-on: docker
     name: Text
+    container: code.hohl.cloud/a11yist:ci
     steps:
-      - uses: https://github.com/ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.3.4' # Not needed with a .ruby-version file
       - name: Cache repository
         uses: actions/cache@v4
         id: cache-repository
         with:
-          path: repository
+          path: .
           key: ${{ runner.os }}-repository-${{ github.sha }}
           restore-keys: |
             ${{ runner.os }}-repository-
-      - name: Cache bundle
-        uses: actions/cache@v4
-        id: cache-bundle
-        with:
-          path: /usr/local/bundle
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
-          path: repository
+          path: .
           submodules: recursive
-      - run: cd repository
       - run: bundle install
       - run: bundle exec rails test