Trebejo.Git.Credentials (Trebejo v2.0.0)

Git credential and SSH key configuration helpers.

Splits out the credential setup helpers from Trebejo.Git.Local so the local git operations module remains focused on clone/sync/branch workflows.

Not part of the public API — used only by Trebejo.Git.Local.

Note: Uses System.cmd/3 directly via Trebejo.Util.run_cmd_legacy/3 to avoid a circular dependency with Trebejo.Git.Local.run_git/1 (which is private).

Summary

Configures git's credential.helper to the given helper string.

Configures git's core.sshCommand to use the given SSH key path.

@spec setup_credential_helper(String.t()) :: :ok | {:error, term()}

Configures git's credential.helper to the given helper string.

@spec setup_ssh_key(Path.t()) :: :ok | {:error, term()}

Configures git's core.sshCommand to use the given SSH key path.

Returns :ok on success or {:error, reason} if the key doesn't exist or git config fails.