Add check if run from gitlab development kit root directory.

scripts/pre-commit

 #!/bin/sh
+
+# Check if file exists with -f. Check if in in the gdk rook directory.
+if [ ! -f ../GDK_ROOT ]; then
+  echo "Please run pre-commit from gitlab (e.g. gitlab-development-kit/gitlab) root directory."
+  exit 1
+fi
+
 jsfiles=$(git diff --cached --name-only --diff-filter=ACM "*.js" | tr '\n' ' ')
 [ -z "$jsfiles" ] && exit 0