ci: Added CI job to publish docker image

Author: Dexter Duckworth

.github/workflows/docker-publish.yaml

@@ -0,0 +1,39 @@
+name: Publish Docker Image
+
+on:
+  push:
+    tags: ["*"]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Registry Login
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract Metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME  }}
+      - name: Build and Push
+        uses: docker/build-push-action@v3
+        with:
+          push: true
+          context: .
+          file: ./docker/Dockerfile.alpine
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}