Add GitHub Actions workflow for Docker continuous deployment

.github/workflows/docker-build-push.yml

@@ -0,0 +1,69 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  release:
+    types: [published]
+  workflow_dispatch:
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: dansplugins/dansplugins-dot-com
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          # Tag strategy:
+          # - Branch pushes: branch name (e.g., main)
+          # - Pull requests: pr-<number> (build only, not pushed)
+          # - Releases: semver tags (e.g., 0.9.0, 0.9, 0)
+          # - All events: sha-<commit> for traceability
+          # - Main branch: 'latest' tag
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - 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
+          platforms: linux/amd64,linux/arm64

README.md

@@ -80,6 +80,49 @@ Alternatively, you could execute the `down.sh` script in the project directory:
 ./down.sh
 ```
 
+## Continuous Deployment
+
+This repository is configured with GitHub Actions for automatic Docker image builds and deployments.
+
+### Docker Image
+
+The Docker image is automatically built and pushed to Docker Hub whenever changes are pushed to the `main` branch or when a new release is published.
+
+**Docker Hub Repository:** `dansplugins/dansplugins-dot-com`
+
+### Available Tags
+
+The following tags are available on Docker Hub:
+- `latest` - Latest build from the main branch
+- `main` - Latest build from the main branch
+- `sha-<sha>` - Specific commit SHA (e.g., `sha-abc1234`)
+- Version tags - Semantic versioned releases (e.g., `1.2.3`, `1.2`, `1` without 'v' prefix)
+
+Note: Pull requests trigger builds for validation but images are not pushed to Docker Hub.
+
+### Pulling the Image
+
+To pull and run the latest Docker image:
+
+```bash
+docker pull dansplugins/dansplugins-dot-com:latest
+docker run -p 3000:3000 dansplugins/dansplugins-dot-com:latest
+```
+
+### GitHub Actions Workflow
+
+The workflow is triggered by:
+- Pushes to the `main` branch
+- Pull requests to the `main` branch (build only, no push)
+- Published releases
+- Manual workflow dispatch
+
+### Setup Requirements
+
+For the CI/CD pipeline to work, the following secrets must be configured in the GitHub repository:
+- `DOCKER_USERNAME` - Docker Hub username
+- `DOCKER_PASSWORD` - Docker Hub password or access token
+
 ## Next.js
 This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).