Add GH Action for building Docker image

Author: mthssdrbrg

.github/workflows/docker-build.yml

@@ -0,0 +1,18 @@
+name: docker-build
+on:
+  pull_request:
+  push:
+    branches: [main]
+jobs:
+  buildx:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          install: true
+      - name: Build Docker image
+        run: |
+          docker build . # will run buildx