Create docker-build.yml

.github/workflows/docker-build.yml

@@ -0,0 +1,24 @@
+name: Docker build
+
+on:
+  push:
+    branches:
+      - main
+
+  # Build for any PRs.
+  pull_request:
+
+env:
+  IMAGE_NAME: helloworld
+
+jobs:
+  # Build the container
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run: docker build . --file Dockerfile
+