add workflow

.forgejo/workflows/addin.yml

@@ -0,0 +1,48 @@
+name: Add-in CI
+
+on:
+  push:
+    branches:
+      - main
+      - master
+    paths:
+      - 'addin/**'
+      - 'docker-compose.yml'
+      - '.forgejo/workflows/addin.yml'
+  pull_request:
+    paths:
+      - 'addin/**'
+      - 'docker-compose.yml'
+      - '.forgejo/workflows/addin.yml'
+
+permissions:
+  contents: read
+
+jobs:
+  build-and-test:
+    name: Build and test Word add-in
+    runs-on: ubuntu-latest
+    timeout-minutes: 25
+    defaults:
+      run:
+        working-directory: addin
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install dependencies
+        run: npm install --no-fund --no-audit
+
+      - name: Run tests
+        run: npm test -- --runInBand
+
+      - name: Validate manifest
+        run: npm run validate
+
+      - name: Build add-in
+        run: npm run build