Build linux/arm64 and linux/amd64 Docker Images (#10)

Author: PSchmiedmayer

.github/workflows/docker.yml

@@ -15,8 +15,11 @@ on:
 
 jobs:
   docker:
-    name: Docker Build and Push Image
+    name: Docker Build and Push Image ${{ matrix.architecture }}
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        architecture: [arm64, amd64]
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -27,6 +30,8 @@ jobs:
           fallback: latest
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
+        with:
+          platforms: linux/${{ matrix.architecture }}
       - name: Set up docker buildx
         uses: docker/setup-buildx-action@v1
         with:
@@ -37,13 +42,51 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Determine Base Image
+        uses: haya14busa/action-cond@v1
+        id: baseimage
+        with:
+          cond: ${{ matrix.architecture == 'arm64' }}
+          if_true: 'swiftarm/swift:5.5.1-ubuntu-focal'
+          if_false: 'swift:focal'
       - name: Build and push docker image
         id: buildandpush
         uses: docker/build-push-action@v2
         with:
           context: .
           file: ./Dockerfile
+          build-args: |
+            baseimage=${{ steps.baseimage.outputs.value }}
           push: true
-          tags: ghcr.io/apodini/template:latest,ghcr.io/apodini/template:${{ steps.latesttag.outputs.tag }}
+          platforms: linux/${{ matrix.architecture }}
+          tags: ghcr.io/apodini/template:latest-${{ matrix.architecture }},ghcr.io/apodini/template:${{ steps.latesttag.outputs.tag }}-${{ matrix.architecture }}
       - name: Image digest
         run: echo ${{ steps.buildandpush.outputs.digest }}
+  dockermanifest:
+    needs: [docker]
+    name: Create Multi-CPU Architecture Image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+      - name: Get latest tag
+        id: latesttag
+        uses: WyriHaximus/github-action-get-previous-tag@v1
+        with:
+          fallback: latest
+      - name: Log in to the container registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create and Push Multi Architecture Image
+        run: |
+            docker manifest create ghcr.io/apodini/template:latest \
+              --amend ghcr.io/apodini/template:latest-amd64 \
+              --amend ghcr.io/apodini/template:latest-arm64
+            docker manifest create ghcr.io/apodini/template:${{ steps.latesttag.outputs.tag }} \
+              --amend ghcr.io/apodini/template:${{ steps.latesttag.outputs.tag }}-amd64 \
+              --amend ghcr.io/apodini/template:${{ steps.latesttag.outputs.tag }}-arm64
+            docker manifest push ghcr.io/apodini/template:latest
+            docker manifest push ghcr.io/apodini/template:${{ steps.latesttag.outputs.tag }}

Dockerfile

@@ -6,10 +6,12 @@
 # SPDX-License-Identifier: MIT
 #
 
+ARG baseimage=swift:focal
+
 # ================================
 # Build image
 # ================================
-FROM swiftlang/swift:nightly-5.5-focal as build
+FROM ${baseimage} as build
 
 # Install OS updates and, if needed, sqlite3
 RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
@@ -47,7 +49,7 @@ RUN [ -d "$(swift build --package-path /build -c release --show-bin-path)/WebSer
 # ================================
 # Run image
 # ================================
-FROM swiftlang/swift:nightly-5.5-focal-slim as run
+FROM ${baseimage}-slim as run
 
 # Make sure all system packages are up to date.
 RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \