added a function to extract gitlab ci variables

cbutil/util.py

@@ -55,6 +55,15 @@ def get_git_infos(repo_path: Union[Path, str], *, commit_key="commit", commit_ms
     return {commit_key: commit, commit_msg_key: commit_msg}
 
 
+def get_git_infos_from_env():
+    """ Extract commit, commit message, branch and project id from gitlab ci environment."""
+    return {"commit": os.environ["CI_COMMIT_SHA"],
+            "commit_message": os.environ["CI_COMMIT_MESSAGE"],
+            "project_id": os.environ["CI_PROJECT_ID"],
+            "branch": os.environ["CI_COMMIT_BRANCH"],
+            }
+
+
 def file_time_to_sec(file_path) -> int:
     return int(os.path.getmtime(file_path))