[Core] Auto-cleanup after all update_script executions

Implements central solution for automatic cleanup after updates:
- Modified start() function in build.func to call cleanup_lxc after update_script
- Applies to ALL scripts automatically (no individual script changes needed)
- Prevents disk space growth from accumulated caches (yarn/npm/pnpm/composer/pip/etc)
- Aligns update behavior with install behavior (which already calls cleanup_lxc)

This fixes issue #10117 (Jotty disk space growth) and prevents similar issues
in all other scripts that use package managers.

Benefits:
- Single point of maintenance
- Consistent behavior across all update scripts
- Reduces disk usage after every update
- No need to manually add cleanup_lxc to 100+ update_script functions

Impact: All LXC update operations will now automatically clean caches after
successful completion, just like installations do.

CHANGELOG.md

@@ -12,12 +12,6 @@ Exercise vigilance regarding copycat or coat-tailing sites that seek to exploit
 
 ## 2025-12-19
 
-### 🚀 Updated Scripts
-
-  - #### 🔧 Refactor
-
-    - Refactor: Proxmox-Mail-Gateway [@tremor021](https://github.com/tremor021) ([#10070](https://github.com/community-scripts/ProxmoxVE/pull/10070))
-
 ### ❔ Uncategorized
 
   - Update paymenter.json(#10133) [@DragoQC](https://github.com/DragoQC) ([#10134](https://github.com/community-scripts/ProxmoxVE/pull/10134))

ct/proxmox-mail-gateway.sh

@@ -27,11 +27,10 @@ function update_script() {
     msg_error "No ${APP} Installation Found!"
     exit
   fi
-
-  msg_info "Updating Proxmox-Mail-Gateway"
+  msg_info "Updating ${APP}"
   $STD apt update
-  $STD apt upgrade -y
-  msg_ok "Updated Proxmox-Mail-Gateway"
+  $STD apt -y upgrade
+  msg_ok "Updated ${APP}"
   msg_ok "Updated successfully!"
   exit
 }

install/proxmox-mail-gateway-install.sh

@@ -14,13 +14,16 @@ network_check
 update_os
 
 msg_info "Installing Proxmox Mail Gateway"
-setup_deb822_repo \
-  "pmg" \
-  "https://enterprise.proxmox.com/debian/proxmox-release-trixie.gpg" \
-  "http://download.proxmox.com/debian/pmg" \
-  "trixie" \
-  "pmg-no-subscription"
-$STD apt install -y proxmox-mailgateway-container
+curl -fsSL "https://enterprise.proxmox.com/debian/proxmox-release-trixie.gpg" -o "/usr/share/keyrings/proxmox-release-trixie.gpg"
+cat <<EOF >/etc/apt/sources.list.d/pmg.sources
+Types: deb
+URIs: http://download.proxmox.com/debian/pmg
+Suites: trixie
+Components: pmg-no-subscription
+Signed-By: /usr/share/keyrings/proxmox-release-trixie.gpg
+EOF
+$STD apt update
+$STD apt -y install proxmox-mailgateway-container
 msg_ok "Installed Proxmox Mail Gateway"
 
 motd_ssh

misc/build.func

@@ -2626,8 +2626,8 @@ configure_ssh_settings() {
 #
 # - Entry point of script
 # - On Proxmox host: calls install_script
-# - In silent mode: runs update_script
-# - Otherwise: shows update/setting menu
+# - In silent mode: runs update_script with automatic cleanup
+# - Otherwise: shows update/setting menu and runs update_script with cleanup
 # ------------------------------------------------------------------------------
 start() {
   source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/tools.func)
@@ -2638,6 +2638,7 @@ start() {
     VERBOSE="no"
     set_std_mode
     update_script
+    cleanup_lxc
   else
     CHOICE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "${APP} LXC Update/Setting" --menu \
       "Support/Update functions for ${APP} LXC. Choose an option:" \
@@ -2662,6 +2663,7 @@ start() {
       ;;
     esac
     update_script
+    cleanup_lxc
   fi
 }