add gh workflow (#1)

* add gh workflow

* cache node_modules

* cache subdir

.github/workflows/github-actions.yml

@@ -0,0 +1,33 @@
+name: Lint, format and test (and deploy)
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+  push:
+    branches:
+      - master
+
+jobs:
+  lint-format-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Start databases
+        run: docker compose up -d
+      - name: Cache Node.js modules
+        uses: actions/cache@v3
+        with:
+          path: ./client/node_modules
+          key: ${{ runner.os }}-node-${{ hashFiles('./client/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+      - name: Install Node
+        uses: actions/setup-node@v4
+        with:
+          cache-dependency-path: ./client/package-lock.json
+          node-version: 22.6
+          cache: "npm"
+      - name: Install client dependencies
+        run: npm install
+        working-directory: ./client
+      - name: Run tests
+        run: echo "All good"