new: [compose] provide ``$HOST_COMPOSE_YML_FILE`` location

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

bin/compose

@@ -915,6 +915,7 @@ mk_docker_run_options() {
         docker_path=/var/lib/compose/root/${parent_dir##*/}/${compose_file##*/}
         docker_run_opts+=(
             "-e" "COMPOSE_YML_FILE=${compose_file##*/}"
+            "-e" "HOST_COMPOSE_YML_FILE=${local}"
             "-v" "${local}:${docker_path}:ro"
             "-w" "${docker_path%/*}"
         )