Bypass warning about detached head

[imjasonh]

This avoids log spam like this:

⚠️  aarch64   | Cloning into '/tmp/tmp.Dvzsqj'...
⚠️  aarch64   | Note: switching to 'ec85d900b413d3d9d6f60cece3fb5bc665275087'.
⚠️  aarch64   | 
⚠️  aarch64   | You are in 'detached HEAD' state. You can look around, make experimental
⚠️  aarch64   | changes and commit them, and you can discard any commits you make in this
⚠️  aarch64   | state without impacting any branches by switching back to a branch.
⚠️  aarch64   | 
⚠️  aarch64   | If you want to create a new branch to retain commits you create, you may
⚠️  aarch64   | do so (now or later) by using -c with the switch command. Example:
⚠️  aarch64   | 
⚠️  aarch64   |   git switch -c <new-branch-name>
⚠️  aarch64   | 
⚠️  aarch64   | Or undo this operation with:
⚠️  aarch64   | 
⚠️  aarch64   |   git switch -
⚠️  aarch64   | 
⚠️  aarch64   | Turn off this advice by setting config variable advice.detachedHead to false
⚠️  aarch64   | 
Updating files: 100% (48253/48253), done./48253)

[vaikas]

Thank you!

[vaikas]

Not in this PR, but there's a ton of other spam there that we may at some point reduce as well. Mainly when it's copying the . to the container (I think, or at least that's what it looks like to me).

[vaikas]

Looks like the failure is not a flake?

2023/12/27 16:26:45 ERROR: failed to build package. the build environment has been preserved:
ℹ️  x86_64    |   workspace dir: /tmp/melange-workspace-3112014763
ℹ️  x86_64    |   guest dir: /tmp/melange-guest-2160339963
Error: failed to build package: unable to build guest: unable to generate image: installing apk packages: installing packages: installing gobject-introspection: unable to install files for pkg gobject-introspection: unable to install file over existing one, different contents: usr/bin/gapplication
2023/12/27 16:26:45 error during command execution: failed to build package: unable to build guest: unable to generate image: installing apk packages: installing packages: installing gobject-introspection: unable to install files for pkg gobject-introspection: unable to install file over existing one, different contents: usr/bin/gapplication