adds glab bash completion

Author: Lars Gohlke

tools/git.sh

@@ -135,3 +135,13 @@ function git_clean_merged_branches() {
   done
 }
 export -f git_clean_merged_branches
+
+
+if [[ -z $GLAB_COMPLETION_INSTALLED ]]; then
+  if command -v glab > /dev/null; then
+    # see https://docs.gitlab.com/cli/completion/#bash
+    # shellcheck disable=SC1090
+    source <(glab completion -s bash)
+    export GLAB_COMPLETION_INSTALLED=1
+  fi
+fi