FetchAndMergeSHAs merges any SHAs into the baseBranch which has a tip of baseSha, fetching the commits from remote for the git repo in dir.

LocalBranches will list all local branches.

NewCmdGitMerge creates a command object for the command.

ParsePullRefs parses the Prow PULL_REFS env var formatted string and converts to a map of branch:sha.

ToRegexOrNil returns a regex for non-blank strings or returns an error if it cannot be parsed.

Options the options for the command.

PullRefs is the result of parsing the Prow PULL_REFS.