Add example recipes to build a single image

Sample recipes with new recipe action

Fixes: APERTIS-5675

scripts/ostree-prepare-local-repo.sh

+#!/bin/sh
+
+set -eu
+
+if [ $# -ne 3 ]
+then
+  echo "Usage: $0 REPO PULL_URL BRANCH" >&2
+  exit 1
+fi
+
+repo=$1
+ostree_pull_url=$2
+branch=$3
+
+mkdir -p "${repo}"
+ostree init --repo="${repo}" --mode archive-z2
+ostree remote --repo="${repo}" add --no-gpg-verify origin "${ostree_pull_url}"
+http_code=$(curl --location --silent -o /dev/null --head -w "%{http_code}" "${ostree_pull_url}/refs/heads/${branch}")
+case "$http_code" in
+  200)
+    ostree pull --repo="${repo}" --depth=-1 --mirror --disable-fsync origin "${branch}"
+    ;;
+  404)
+    ;;
+  *)
+    echo "Error: Got HTTP '$http_code' trying to fetch '${ostree_pull_url}/refs/heads/${branch}'"
+    exit 1
+    ;;
+esac