add github action to create docker image

.github/workflows/docker-image.yml

@@ -0,0 +1,33 @@
+name: Build and Push Docker Image to GHCR
+
+on:
+  push:
+    tags:
+      - '*' # Trigger on any tag creation
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      # Check out the code
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      # Log in to GitHub Container Registry
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }} # GitHub token is automatically provided
+
+      # Build the Docker image
+      - name: Build Docker image
+        run: |
+          docker build -t ghcr.io/${{ github.repository }}/sherpa-api-mock:${{ github.ref_name }} .
+
+      # Push the Docker image to GitHub Container Registry
+      - name: Push Docker image
+        run: |
+          docker push ghcr.io/${{ github.repository }}/sherpa-api-mock:${{ github.ref_name }}