Initial commit

Signed-off-by: Aleksander Cynarski <aleksander@cynarski.pl>

.gitea/install_latest_buildah.sh

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+sudo apt-key add - < Release.key
+sudo apt-get update -qq
+sudo apt-get -qq -y install buildah

.gitea/workflows/build.yml

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+name: Multiarch build
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * *'  # every day at midnight
+
+env:
+  PROJECT_DIR: spring-petclinic
+  MVN_REPO_DIR: ~/.m2/repository
+  IMAGE_TAG: latest
+
+jobs:
+  build-multiarch-scratch:
+    name: Build multi-architecture image from scratch
+    env:
+      IMAGE_NAME: testing-multiarch
+      DOCKER_DRIVER: overlay2
+    runs-on: ubuntu-22.04
+
+    steps:
+
+      # Checkout buildah action github repository
+      - name: Checkout Buildah action
+        uses: actions/checkout@v4
+
+      - name: Install latest buildah
+        run: |
+          bash buildah-build/.gitea/install_latest_buildah.sh
+
+      - name: Install qemu dependency
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y qemu-user-static
+
+      - name: Build Image
+        id: build_image_multiarch
+        uses: redhat-actions/buildah-build@v2
+        with:
+          image: ${{ env.IMAGE_NAME }}
+          tags: ${{ env.IMAGE_TAG }}
+          base-image: 'registry.access.redhat.com/ubi9-minimal:9.5'
+          archs: amd64, i386, ppc64le
+          # To avoid hardcoding a particular version of the binary.
+          containerfiles: |
+            ./Containerfile
+          extra-args: |
+            --isolation=chroot
+          port: 8080
+          workdir: "."
+
+      - name: Echo Outputs
+        run: |
+          echo "Image: ${{ steps.build_image_multiarch.outputs.image }}"
+          echo "Tags: ${{ steps.build_image_multiarch.outputs.tags }}"
+          echo "Tagged Image: ${{ steps.build_image_multiarch.outputs.image-with-tag }}"
+
+      - name: Check images created
+        run: buildah images | grep '${{ env.IMAGE_NAME }}'
+
+      - name: Check manifest
+        run: |
+          set -x
+          buildah manifest inspect ${{ steps.build_image_multiarch.outputs.image }}:${{ env.IMAGE_TAG }}

Containerfile

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+FROM registry.access.redhat.com/ubi9-minimal:9.5
+
+RUN yum install -y kubectl \
+    && yum clean all \
+    && rm -rf /var/cache/yum