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

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)
+}