add files for building containter artifacts

Lifted in large parts from version 9.5 of the SCL postgresql container.

https://github.com/sclorg/postgresql-container

root/usr/bin/run-postgresql

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+export ENABLE_REPLICATION=${ENABLE_REPLICATION:-false}
+
+set -eu
+export_vars=$(cgroup-limits) ; export $export_vars
+
+source "${CONTAINER_SCRIPTS_PATH}/common.sh"
+
+set_pgdata
+check_env_vars
+generate_passwd_file
+generate_postgresql_config
+
+if [ ! -f "$PGDATA/postgresql.conf" ]; then
+  initialize_database
+  NEED_TO_CREATE_USERS=yes
+fi
+
+pg_ctl -w start -o "-h ''"
+if [ "${NEED_TO_CREATE_USERS:-}" == "yes" ]; then
+  create_users
+fi
+set_passwords
+pg_ctl stop
+
+unset_env_vars
+exec postgres "$@"