helpers / gitPullOrClone - support shallow cloning of submodules

When doing a shallow clone, also add --shallow-submodules which will do a shallow clone of submodules
with depth 1.

This significantly speeds up checkouts of repositories with a lot of submodules (eg lr-tic80).

Author: joolswills

scriptmodules/helpers.sh

@@ -435,7 +435,7 @@ function gitPullOrClone() {
     else
         local git="git clone --recursive"
         if [[ "$depth" -gt 0 ]]; then
-            git+=" --depth $depth"
+            git+=" --depth $depth --shallow-submodules"
         fi
         git+=" --branch $branch"
         printMsgs "console" "$git \"$repo\" \"$dir\""