Create helper OCI images for use in CI. (#899)

.github/workflows/docker-images.yml

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+---
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+name: Helper Docker images for testing
+on:
+  # Run CI against all pushes (direct commits, also merged PRs), Pull Requests
+  push:
+    branches:
+      - main
+    paths:
+      - .github/workflows/docker-images.yml
+      - tests/images/**
+  pull_request:
+    branches:
+      - main
+    paths:
+      - .github/workflows/docker-images.yml
+      - tests/images/**
+  # Run CI once per day (at 03:00 UTC)
+  schedule:
+    - cron: '0 3 * * *'
+
+env:
+  CONTAINER_REGISTRY: ghcr.io/ansible-collections
+
+jobs:
+  build:
+    name: Build image ${{ matrix.name }}:${{ matrix.tag }}
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: simple-1
+            tag: latest
+          - name: simple-2
+            tag: latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get install podman buildah
+
+      - name: Set up Go 1.22
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.22'
+
+      - name: Build ${{ matrix.name }} image
+        run: |
+          ./build.sh "${CONTAINER_REGISTRY}/${{ matrix.name }}:${{ matrix.tag }}"
+        working-directory: tests/images/${{ matrix.name }}
+
+      - name: Publish container image as ${{ env.CONTAINER_REGISTRY }}/${{ matrix.name }}:latest
+        if: github.event_name != 'pull_request'
+        uses: redhat-actions/push-to-registry@v2
+        with:
+          registry: ${{ env.CONTAINER_REGISTRY }}
+          image: ${{ matrix.name }}
+          tags: ${{ matrix.tag }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}

tests/images/build.sh

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+#!/usr/bin/env bash
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+if [ ! -e main.go ]; then
+    echo "Must be run in a directory that contains main.go."
+    exit 1
+fi
+
+set -eux
+IMAGE_NAME="${1:-localhost/$(basename "$(pwd)"):latest}"
+podman manifest rm "${IMAGE_NAME}" || true
+podman image rm "${IMAGE_NAME}" || true
+buildah manifest create "${IMAGE_NAME}"
+for ARCH in amd64 arm64; do
+    rm -f "main-${ARCH}"
+    GOARCH="${ARCH}" go build -ldflags "-s -w" -o "main-${ARCH}" main.go
+
+    WORKING_CONTAINER="$(buildah from --arch "${ARCH}" scratch)"
+    buildah copy "${WORKING_CONTAINER}" "main-${ARCH}" "/runme"
+    buildah config --entrypoint '["/runme"]' "${WORKING_CONTAINER}"
+    buildah commit --manifest "${IMAGE_NAME}" "${WORKING_CONTAINER}"
+
+    rm -f "main-${ARCH}"
+done

tests/images/simple-1/build.sh

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+../build.sh

tests/images/simple-1/main.go

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+/*
+  Copyright (c) Ansible Project
+  GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+  SPDX-License-Identifier: GPL-3.0-or-later
+*/
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"time"
+)
+
+func main() {
+	var delay time.Duration
+	if len(os.Args) > 2 {
+		fmt.Fprintf(os.Stderr, "%s must have 0 or 1 argument, not %d arguments\n", os.Args[0], len(os.Args))
+		os.Exit(1)
+	} else if len(os.Args) == 2 {
+		var err error
+		delay, err = time.ParseDuration(os.Args[1])
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Cannot parse delay duration: %s\n", err)
+			os.Exit(1)
+		}
+		if delay.Microseconds() < 0 {
+			fmt.Fprintf(os.Stderr, "Delay must not be negative!\n")
+			os.Exit(1)
+		}
+	}
+	fmt.Println("Hello!")
+	time.Sleep(delay)
+}

tests/images/simple-2/build.sh

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+../build.sh

tests/images/simple-2/main.go

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+/*
+  Copyright (c) Ansible Project
+  GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+  SPDX-License-Identifier: GPL-3.0-or-later
+*/
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"time"
+)
+
+func main() {
+	var delay time.Duration
+	if len(os.Args) > 2 {
+		fmt.Fprintf(os.Stderr, "%s must have 0 or 1 argument, not %d arguments\n", os.Args[0], len(os.Args))
+		os.Exit(1)
+	} else if len(os.Args) == 2 {
+		var err error
+		delay, err = time.ParseDuration(os.Args[1])
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Cannot parse delay duration: %s\n", err)
+			os.Exit(1)
+		}
+		if delay.Microseconds() < 0 {
+			fmt.Fprintf(os.Stderr, "Delay must not be negative!\n")
+			os.Exit(1)
+		}
+	}
+	fmt.Println("World!")
+	time.Sleep(delay)
+}