ci: build and push Docker images

.github/workflows/docker.yaml

@@ -0,0 +1,87 @@
+name: Build and push Docker image
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "v*.*.*"
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+
+    env:
+      DOCKER_IMAGE_BASE: ghcr.io/connecteurs/alpine
+      DOCKER_IMAGE_CURL: ghcr.io/connecteurs/alpine-curl
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker meta
+        id: docker_meta
+        uses: docker/metadata-action@v5
+        with:
+          images: "${{ env.DOCKER_IMAGE_BASE }}"
+          tags: |
+            type=ref,event=branch
+            type=semver,prefix=v,pattern={{version}}
+            type=semver,prefix=v,pattern={{major}}.{{minor}}
+            type=semver,prefix=v,pattern={{major}}
+            type=sha
+
+      - name: Docker meta (with curl included)
+        id: docker_meta_curl
+        uses: docker/metadata-action@v5
+        with:
+          images: "${{ env.DOCKER_IMAGE_CURL }}"
+          tags: |
+            type=ref,event=branch
+            type=semver,prefix=v,pattern={{version}}
+            type=semver,prefix=v,pattern={{major}}.{{minor}}
+            type=semver,prefix=v,pattern={{major}}
+            type=sha
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
+          platforms: |
+            linux/amd64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Build and push Docker image (with curl included)
+        uses: docker/build-push-action@v5
+        with:
+          context: ./curl
+          file: ./Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.docker_meta_curl.outputs.tags }}
+          labels: ${{ steps.docker_meta_curl.outputs.labels }}
+          platforms: |
+            linux/amd64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max