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: spring-petclinic-multiarch
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+      matrix:
+        install_latest: [ true, false ]
+
+    steps:
+
+      # Checkout buildah action github repository
+      - name: Checkout Buildah action
+        uses: actions/checkout@v4
+        with:
+          path: "buildah-build"
+
+      - name: Install latest buildah
+        if: matrix.install_latest
+        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
+
+      # Checkout spring-petclinic github repository
+      - name: Checkout spring-petclinic project
+        uses: actions/checkout@v4
+        with:
+          repository: "spring-projects/spring-petclinic"
+          path: ${{ env.PROJECT_DIR }}
+
+      # Setup java.
+      - name: Setup Java
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+          cache: 'maven'
+
+      # Run maven to build the project
+      - name: Maven
+        working-directory: ${{ env.PROJECT_DIR }}
+        run: |
+          mvn package -ntp -B
+
+      - name: Build Image
+        id: build_image_multiarch
+        uses: https://github.com/marketplace/actions/buildah-build@v2
+        with:
+          image: ${{ env.IMAGE_NAME }}
+          tags: ${{ env.IMAGE_TAG }}
+          base-image: 'registry.access.redhat.com/openjdk/openjdk-11-rhel7'
+          archs: amd64, i386, ppc64le
+          # To avoid hardcoding a particular version of the binary.
+          content: |
+            ./spring-petclinic/target/spring-petclinic-*.jar
+          entrypoint: |
+            java
+            -jar
+            spring-petclinic-*.jar
+          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 }}