add build docker image to CI

Author: mtrezza

.github/workflows/ci.yml

@@ -71,6 +71,30 @@ jobs:
        - name: Install dependencies
          run: npm ci
        - run: npm run madge:circular
+  check-docker:
+    name: Docker Build
+    timeout-minutes: 5
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.NODE_VERSION }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Cache Node.js modules
+        uses: actions/cache@v2
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ matrix.NODE_VERSION }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-${{ matrix.NODE_VERSION }}-
+      - name: Install dependencies
+        run: npm ci
+      - name: Build docker image
+        uses: docker/build-push-action@v2
+        with:
+          push: false
+          tags: user/app:latest
   check-mongo:
     strategy:
       matrix: