Add support for multi-arch containers

Create the kas and kas-isar containers also for arm64. This allows using
them for arm-native builds, e.g. in AWS instances.

We need to drop a couple of packages from arm64 images which do not
exist on that arch. If the kas image is usable for Yocto builds is
untested, though. The Isar image works.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

.github/workflows/master.yml

@@ -22,6 +22,10 @@ jobs:
           else
               echo "PUSH_MASTER=true" >> $GITHUB_ENV
           fi
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
       - name: Login to ghcr.io
         uses: docker/login-action@v1
         with:
@@ -31,11 +35,13 @@ jobs:
       - name: Build kas image
         uses: docker/build-push-action@v2
         with:
+          platforms: linux/amd64,linux/arm64
           push: ${{ env.PUSH_MASTER }}
           tags: ghcr.io/siemens/kas/kas
       - name: Build kas-isar image
         uses: docker/build-push-action@v2
         with:
           file: Dockerfile.isar
+          platforms: linux/amd64,linux/arm64
           push: ${{ env.PUSH_MASTER }}
           tags: ghcr.io/siemens/kas/kas-isar

.github/workflows/next.yml

@@ -48,6 +48,10 @@ jobs:
     steps:
       - name: Check out repo
         uses: actions/checkout@v2
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
       - name: Login to ghcr.io
         uses: docker/login-action@v1
         with:
@@ -57,12 +61,14 @@ jobs:
       - name: Build kas image
         uses: docker/build-push-action@v2
         with:
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: ghcr.io/siemens/kas/kas:next
       - name: Build kas-isar image
         uses: docker/build-push-action@v2
         with:
           file: Dockerfile.isar
+          platforms: linux/amd64,linux/arm64
           build-args: KAS_TAG=next
           push: true
           tags: ghcr.io/siemens/kas/kas-isar:next

.github/workflows/release.yml

@@ -14,6 +14,10 @@ jobs:
         uses: actions/checkout@v2
       - name: Get release
         run: echo "RELEASE_VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
       - name: Login to ghcr.io
         uses: docker/login-action@v1
         with:
@@ -23,6 +27,7 @@ jobs:
       - name: Build kas image
         uses: docker/build-push-action@v2
         with:
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: |
             ghcr.io/siemens/kas/kas
@@ -32,6 +37,7 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           file: Dockerfile.isar
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: |
             ghcr.io/siemens/kas/kas-isar

Dockerfile

@@ -2,6 +2,7 @@
 
 FROM debian:buster-slim
 
+ARG TARGETPLATFORM
 ARG DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update && \
@@ -10,14 +11,17 @@ RUN apt-get update && \
 ENV LANG=en_US.utf8
 
 RUN apt-get install --no-install-recommends -y \
-        gawk wget git-core diffstat unzip texinfo gcc-multilib \
+        gawk wget git-core diffstat unzip texinfo \
         build-essential chrpath socat cpio python python3 python3-pip python3-pexpect \
         xz-utils debianutils iputils-ping python3-git python3-jinja2 libegl1-mesa libsdl1.2-dev \
         pylint3 xterm \
         python3-setuptools python3-wheel python3-yaml \
         gosu lsb-release file vim less procps tree tar bzip2 zstd bc tmux libncurses-dev \
-        dosfstools mtools parted syslinux \
+        dosfstools mtools parted \
         git-lfs mercurial iproute2 ssh-client curl rsync gnupg awscli && \
+    if [ "$TARGETPLATFORM" = "linux/amd64" ]; then \
+        apt-get install --no-install-recommends -y gcc-multilib syslinux; \
+    fi && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*