Automations don't work with Jujutsu VCS changes

[mattvmsft]

Short summary

Automations fail to run because my repo uses JJ for version control which puts the underlying Git repo in a Detached HEAD state

Affected version or release

v1.0.6

Installation context

No response

What happened?

When automations get triggered, the following error message is surfaced:
Branch workflow cannot start from a detached HEAD. Check out the branch you want this workflow to run on, then run it again.

Steps to reproduce

1. Initialize JJ in a Git repo
2. Create a new JJ change
3. Create an automation on that repo

Expected behavior

The automation is able to run successfully

Additional context

No response