Add GitHub Actions workflow for CI/CD deployment

.github/workflows/ghcr.yml

@@ -0,0 +1,44 @@
+name: CI/CD Deploy Go-HTMX-SQLite App
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    # Step 1: Log in to GHCR
+    - name: Log in to GitHub Container Registry
+      uses: docker/login-action@v2
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GHCR_PAT }}
+
+    # Step 2: Build Docker image
+    - name: Build Docker image
+      run: |
+        docker build -t ghcr.io/${{ github.repository_owner }}/my_website:latest .
+
+    # Step 3: Push image to GHCR
+    - name: Push Docker image
+      run: |
+        docker push ghcr.io/${{ github.repository_owner }}/my_website:latest
+
+    # Step 4: Deploy to server via SSH
+    - name: Deploy to server
+      uses: appleboy/ssh-action@v1
+      with:
+        host: ${{ secrets.SERVER_IP }}
+        username: ${{ secrets.SERVER_USER }}
+        key: ${{ secrets.SERVER_SSH_KEY }}
+        script: |
+          cd /home/dilanka/my_website
+          docker pull ghcr.io/${{ github.repository_owner }}/my_website:latest
+          docker compose down
+          docker compose up -d