devel/forgejo-runner: Add supervisor mode for daemon(8)

If the server is not available when act_runner starts, act_runner
terminates.

Notes:

1. This is a breaking change - previously set act_runner_flags specified in rc.conf are applied to daemon(8), not act_runner. To pass parameters to act_runner, act_runner_args is used.
2. The system must be updated due to FreeBSD-EN-25:06.daemon.

While here fix build with non-default user/group and split long line.

PR: 288957