feat: add support for cloning/syncing from a remote repository

This makes it a bit easier for external projects to implement deploy webhooks by exposing the ability to sync from a git repository/sha.

plugins/git/help-functions

@@ -27,7 +27,11 @@ help_desc
 fn-help-content() {
   declare desc="return help content"
   cat <<help_content
+    git:allow-host <host>, Adds a host to known_hosts
+    git:clone [--build] <app> <repository> [<git-ref>], Creates an app from remote git repo
+    git:fetch [--build] <app> <repository> [<git-ref>], Fetch the app at an optional repo object and build the codebase
     git:initialize <app>, Initialize a git repository for an app
+    git:public-key, Outputs the dokku public deploy key
     git:report [<app>] [<flag>], Displays a git report for one or more apps
     git:set <app> <property> (<value>), Set or clear a git property for an app
 help_content