Add multi-package Alpine packaging

scripts/apk/test-install.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+. "${repo_root}/scripts/apk/package-lib.sh"
+
+while IFS= read -r package_dir; do
+  apk_validate_package_dir "${package_dir}"
+  apk_run_package_hook "${repo_root}" "${package_dir}" test-install
+done < <(apk_package_dirs "${repo_root}")