Added github action to test build the docker image

.github/workflows/docker-test-build.yml

@@ -0,0 +1,29 @@
+name: Docker test build
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  build-image:
+    runs-on: ubuntu-latest
+
+    # steps taken (and trimmed) from docker-publish.yml
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        with:
+          context: .
+          push: false