[add] github workflow

.github/workflows/docker-publish.yml

@@ -0,0 +1,56 @@
+name: Docker Build and Publish
+
+on:
+  push:
+    branches:
+      - main
+      - develop
+  pull_request:
+    branches:
+      - main
+      - develop
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=sha,format=long
+            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

README.md

@@ -66,7 +66,31 @@ All API endpoints require a Bearer token which can be generated from the admin p
 - DELETE endpoint `/api/v1/vouchers/{code}` to remove vouchers
 - Request logging middleware to track API requests with timing information
 - Improved error handling for voucher creation with detailed error messages
+- GitHub Actions workflow for automated Docker image builds
+- Container Registry integration for Docker image distribution
 
 #### Changed
 - Enhanced API error responses to include more detailed information
 - Updated Swagger documentation with new delete endpoint
+
+## CI/CD Pipeline
+
+The project uses GitHub Actions for continuous integration and delivery:
+
+### Docker Image Publishing
+- Images are automatically built and published to GitHub Container Registry
+- Tags are created for:
+  - Branch names (e.g., `develop`, `main`)
+  - Git SHA (for precise version tracking)
+  - Latest tag (only for main branch)
+
+### Pull Images
+```bash
+# Pull latest main branch image
+docker pull ghcr.io/[username]/voucher-management:latest
+
+# Pull specific branch
+docker pull ghcr.io/[username]/voucher-management:develop
+```
+
+Replace `[username]` with your GitHub username.