Add Forgejo actions workflow

.forgejo/workflows/build.yaml

@@ -0,0 +1,20 @@
+name: Build
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v3
+      - name: Setup NodeJS
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+      - name: Install dependencies
+        run: yarn
+      - name: Lint app
+        run: yarn lint
+      - name: Check app
+        run: yarn check
+      - name: Build app
+        run: yarn build