add rpm generation code

src/postinstall.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if command -v systemctl >/dev/null 2>&1; then
+    systemctl daemon-reload || :
+    if [ "$1" -eq 1 ]; then
+        systemctl enable --now vctp.service || :
+    else
+        systemctl try-restart vctp.service || :
+    fi
+fi