Add workflow to build and push Docker image to GitHub Container Registry

.github/workflows/docker-image.yml

@@ -0,0 +1,34 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: docker/login-action@v2.2.0
+        with:
+          registry: ghcr.io
+          username: ${{github.actor}}
+          password: ${{secrets.GITHUB_TOKEN}}
+
+      - uses: docker/metadata-action@v4.6.0
+        id: meta
+        with:
+          images: ghcr.io/groceries
+
+      - uses: docker/build-push-action@v4.1.1
+        with:
+          context: .
+          push: true
+          tags: ${{steps.meta.outputs.tags}}
+          labels: ${{steps.meta.outputs.labels}}