Reinitialized existing Git repository in /home/gitlab-runner/builds/aSCqEFpA/0/priyaranjan.dr/my_first_pipeline/.git/ Checking out f99cb512 as master... Skipping Git submodules setup Executing "step_script" stage of the job script $ docker build -t $TAG_COMMIT -t $TAG_LATEST . invalid argument "/master:f99cb512" for "-t, --tag" flag: invalid reference format See 'docker build --help'. Cleaning up file based variables ERROR: Job failed: exit status 1