CLI: deploy detect default branch of repo if not set

[KiaraGrouwstra]

Clear and concise description of the problem

woodpecker-cli deploy --help now tells us:

   --branch value            branch filter (default: "master")

the git community tho seems to have been moving from the name master to main.

Suggested solution

it would be nice if woodpecker allowed configuring the default branch (and update cli documentation) to reflect this.

Alternative

default to main over master

Additional context

related thread on gitea: #480

Validations

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[anbraten]

I would suggest that the command queries the repo endpoint first to get the default branch of a repo and uses that in case the user hasn't passed --branch. Was that what you suggested as well?

[KiaraGrouwstra]

that sounds sane to me, yeah.
if that's already the present behavior then this may be mostly about how the cli documents the current situation.

[anbraten]

was solved by #3867