Added Docker Build workflow (Github Workflows)

.github/workflows/docker-build.yml

@@ -0,0 +1,19 @@
+name: Docker Build
+
+on:
+  pull_request:
+
+jobs:
+  buildx:
+    name: Docker Build
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Setup Docker Buildx
+      uses: docker/setup-buildx-action@v1.5.1
+      id: buildx
+      with:
+        install: true
+    - name: Build
+      run: docker build . # will run buildx