ci: run check, tests and build on pull requests

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.gitea/workflows/check.yml

@@ -0,0 +1,18 @@
+name: check
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 24
+      - run: npm ci
+      - run: npm run check
+      - run: npm test
+      - run: npm run build