Function propose 

pub async fn propose<G, F>(
    git: &G,
    forge: &F,
    state: &ReleaseState,
    request: ConfiguredProposal<'_>,
) -> Result<ProposalOutcome, Error>
where
    G: GitHistory + GitRefs + ProposalGit,
    F: ForgeProposal,

Maintain the release proposal branch and its pull request.

Reads the marker of the open proposal pull request, synchronizes the branch, and creates or updates the pull request with the new marker.

Errors

Returns an error for invalid release configuration, analysis failures, unsafe branch updates, or forge failures.