Feat: enable arm64 builds

.github/workflows/docker-image.yml

@@ -1,18 +1,61 @@
-name: Docker Image CI
+name: Build and Push Docker Image
 
 on:
   push:
-    branches: [ "master" ]
+    branches:
+      - master
   pull_request:
-    branches: [ "master" ]
+    branches:
+      - master
 
 jobs:
-
   build:
-
     runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
 
     steps:
-    - uses: actions/checkout@v3
-    - name: Build the Docker image
-      run: docker build . --file Dockerfile --tag dweomer/stunnel:$(date +%s)
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      # Set up Docker Buildx for multi-architecture builds
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      # Cache Docker layers for faster builds
+      - name: Cache Docker Layers
+        uses: actions/cache@v3
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-latest
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Log in to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Log into registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and Push Docker Image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            ${{ secrets.DOCKER_USERNAME }}/stunnel:latest
+            ghcr.io/${{ github.repository_owner }}/stunnel:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          push: ${{ github.event_name != 'pull_request' }}