build_library: Add manglefs script for podman sysext

Debug symbols and development files get removed. /etc content is
temporarily pushed to /usr/share/flatcar/etc, which doesn't work.

Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>

build_library/sysext_mangle_podman-flatcar

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -euo pipefail
+rootfs="${1}"
+
+#find "${rootfs}"
+# Remove debug
+rm -rf "${rootfs}"/usr/{lib/debug/,lib64/cmake/,include/}
+
+mkdir -p "${rootfs}"/usr/share/flatcar/etc
+rm -rf "${rootfs}"/etc/{csh.env,environment.d/,profile.env}
+cp -a "${rootfs}"/etc/. "${rootfs}"/usr/share/flatcar/etc/
+
+#script_root="$(cd "$(dirname "$0")/../"; pwd)"
+#files_dir="${script_root}/sdk_container/src/third_party/coreos-overlay/coreos/sysext/docker"
+
+#echo ">>> NOTICE $0: installing extra files from '${files_dir}'"
+#cp -va "${files_dir}/"* "${rootfs}"
+
+#mkdir -p "${rootfs}/usr/lib/systemd/system/sockets.target.d"
+#{ echo "[Unit]"; echo "Upholds=docker.socket"; } > "${rootfs}/usr/lib/systemd/system/sockets.target.d/10-docker-socket.conf"