chore: remove unused upgrade steps

nfpm/scripts/postinstall.sh

@@ -45,28 +45,17 @@ cleanInstall() {
     fi
 }
 
-# upgrade() {
-#     # Step 3(upgrade), do what you need
-#     # TODO - do I need upgrade steps?
-# }
-
-# Step 2, check if this is a clean install or an upgrade
+# Step 2, check if this is a clean install
 action="$1"
 if  [ "$1" = "configure" ] && [ -z "$2" ]; then
   # Alpine linux does not pass args, and deb passes $1=configure
   action="install"
-elif [ "$1" = "configure" ] && [ -n "$2" ]; then
-    # deb passes $1=configure $2=<current version>
-    action="upgrade"
 fi
 
 case "$action" in
   "1" | "install")
     cleanInstall
     ;;
-  "2" | "upgrade")
-    upgrade
-    ;;
   *)
     cleanInstall
     ;;