Before this commit besadii only worked for repos having
'refs/heads/canon' as main branch.
Change-Id: Ia2ceb8a720c675be84bc3d81b89338522cea6ebd
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5862
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: asmundo <asmundo@gmail.com>