Add GitHub CI workflow for slim lint

.github/workflows/ci.yml

@@ -108,3 +108,33 @@ jobs:
           skip_install: true
           use_bundler: true
           fail_on_error: true
+
+  slim-lint:
+    permissions:
+      # Required: allow read access to the content for analysis.
+      contents: read
+      # Allow write access to checks to allow the action to annotate code in the PR.
+      checks: write
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.3
+          bundler-cache: true
+
+      - name: Run slim-lint
+        run: bundle exec slim-lint app/views --reporter checkstyle > checkstyle-result.xml
+
+      - name: Upload slim-lint results as GitHub annotations
+        uses: lcollins/checkstyle-github-action@v2.0.0
+        if: ${{ success() || failure() }}
+        with:
+          name: Slim-Lint Report
+          title: Analyze Slim templates for linting issues
+          path: checkstyle-result.xml