chore(scripts): ignore untracked files and print custom checkout path in logs (#117)

browser_patches/prepare_checkout.sh

@@ -49,7 +49,7 @@ fi
 if [[ $# == 2 ]]; then
   echo "WARNING: using custom checkout path $CHECKOUT_PATH"
   CHECKOUT_PATH=$2
-  FRIENDLY_CHECKOUT_PATH="<custom_checkout>"
+  FRIENDLY_CHECKOUT_PATH="<custom_checkout('$2')>"
 fi
 
 # if there's no checkout folder - checkout one.
@@ -72,7 +72,7 @@ fi
 cd $CHECKOUT_PATH
 
 # Bail out if git repo is dirty.
-if [[ -n $(git status -s) ]]; then
+if [[ -n $(git status -s --untracked-files=no) ]]; then
   echo "ERROR: $FRIENDLY_CHECKOUT_PATH has dirty GIT state - commit everything and re-run the script."
   exit 1
 fi