add possibility to create package

lib/data/templates/postgresql/postgresql.service

@@ -0,0 +1,29 @@
+[Unit]
+Description=PostgreSQL <%= version %> database server
+After=network.target
+
+[Service]
+Type=notify
+
+User=postgres
+Group=services
+
+ExecStart=<%= prefix %>/bin/postgres -D <%= database_path %>/data
+ExecReload=/bin/kill -HUP $MAINPID
+KillMode=mixed
+TimeoutSec=300
+Restart=on-failure
+NotifyAccess=all
+
+# Security
+ProtectSystem=full
+ProtectHome=true
+PrivateTmp=true
+NoNewPrivileges=true
+
+# Resource Limits
+LimitNOFILE=65536
+
+[Install]
+WantedBy=multi-user.target
+