Docker GitHub Workflow (#4)

add GitHub workflow for building docker image

.github/workflows/docker.yml

@@ -0,0 +1,34 @@
+name: Build and deploy Docker image
+
+on:
+  push:
+  release:
+    types:
+      - published
+
+jobs:
+  build-deploy-docker:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout tree
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: "\
+            ghcr.io/${{ github.repository }}:${{ github.sha }},\
+            ghcr.io/${{ github.repository }}:\
+              ${{ github.head_ref || github.ref_name }}"