add GitHub Actions CI/CD pipeline

.github/workflows/docker-publish.yml

@@ -0,0 +1,53 @@
+name: CI/CD
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  packages: write
+
+env:
+  IMAGE_NAME: ghcr.io/aldriondev/http-server-devops
+
+jobs:
+  build:
+    name: Test, build and publish
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Run tests
+        run: go test ./...
+
+      - name: Log in to github container registry
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up docker buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and optionally push docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+          tags: |
+            ${{ env.IMAGE_NAME }}:latest
+            ${{ env.IMAGE_NAME }}:${{ github.sha }}

README.md

@@ -8,7 +8,7 @@ containerization, CI/CD, Kubernetes deployment, and Terraform infrastructure.
 - **Language:** Go
 - **Container:** Docker
 - **CI/CD:** GitHub Actions
-- **Registry:** Docker Hub
+- **Registry:** GitHub Container Registry
 - **Orchestration:** Kubernetes
 - **IaC:** Terraform
 
@@ -17,7 +17,8 @@ containerization, CI/CD, Kubernetes deployment, and Terraform infrastructure.
 ```text
 http-server-devops/
 ├── .github/
-│   └── workflows/       # CI/CD pipeline
+│   └── workflows/
+│       └── docker-publish.yml
 ├── k8s/                 # Kubernetes manifests
 ├── terraform/           # Terraform configuration
 ├── Dockerfile
@@ -31,7 +32,7 @@ http-server-devops/
 
 - [x] Task 1: HTTP Server
 - [x] Task 2: Dockerize
-- [ ] Task 3: CI/CD Pipeline
+- [x] Task 3: CI/CD Pipeline
 - [ ] Task 4: Kubernetes Deployment
 - [ ] Task 5: Terraform Configuration
 
@@ -94,3 +95,45 @@ docker run --rm -p 9090:9090 -e PORT=9090 http-server-devops:local
 ```bash
 curl http://localhost:9090/
 ```
+
+## CI/CD
+
+This project uses GitHub Actions to run tests, build the Docker image, and publish it to GitHub Container Registry.
+
+The workflow is defined in:
+
+```text
+.github/workflows/docker-publish.yml
+```
+
+On pull requests to `main`, the pipeline:
+
+- runs Go tests
+- builds the Docker image without publishing it
+
+On pushes to `main`, the pipeline:
+
+- runs Go tests
+- builds the Docker image
+- publishes the image to GitHub Container Registry
+
+Published image:
+
+```text
+ghcr.io/aldriondev/http-server-devops
+```
+
+Published tags:
+
+- `latest`
+- ghcr.io/aldriondev/http-server-devops:latest
+
+The workflow uses the built-in GITHUB_TOKEN with following permissions:
+
+```yaml
+permissions:
+  contents: read
+  packages: write
+```
+
+No external Docker registry credentials are required.