Add workflow to build package Docker on GitHub

.github/workflows/docker_pub.yaml

@@ -0,0 +1,25 @@
+name: Publish Docker image
+
+on:
+  push:
+    branches: [ add-docker ]
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to GitHub Packages
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ghcr.io/${{ github.repository }}:latest