fix(ci): partially revert checking out head from current clone. #4693
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Resolved issues:
none
Description of changes:
To check against ^HEAD, we were cloning from the existing filesystem's clone. This breaks under certain internal build scenarios where our .git folder is in a different place. Go back to cloning from GitHub for non Nix use, but leave the current behavior inside a Nix shell.
Call-outs:
Cloning inside a nix devshell is throwing an error, appears to be related to NixOS/nixpkgs#299949 .
ad-hoc test run of the cross_compat test with these changes
Testing:
How is this change tested (unit tests, fuzz tests, etc.)? CI, ad-hoc
Is this a refactor change? no
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