alpine-install: switch to using GitHub to fetch tools when using GitHub (#7566)

misc/alpine-install.func

@@ -82,7 +82,7 @@ network_check() {
 update_os() {
   msg_info "Updating Container OS"
   $STD apk -U upgrade
-  source <(curl -fsSL https://git.community-scripts.org/community-scripts/ProxmoxVED/raw/branch/main/misc/tools.func)
+  source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/tools.func)
   msg_ok "Updated Container OS"
 }