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

tests/images/build.sh

@@ -0,0 +1,26 @@
+#!/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