Add CI

.forgejo/workflows/check.yml

@@ -0,0 +1,45 @@
+name: Check
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+
+jobs:
+  check:
+    runs-on: docker
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22.x'
+          check-latest: true
+
+      # package-lock.json is gitignored, so cache the global npm download cache
+      # keyed on package.json rather than relying on `npm ci` + a lockfile.
+      - name: Cache npm dependencies
+        uses: actions/cache@v4
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-npm-${{ hashFiles('package.json') }}
+          restore-keys: |
+            ${{ runner.os }}-npm-
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Check formatting
+        run: npm run format
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Type-check
+        run: npm test
+
+      - name: Build
+        run: npm run build