fix(worker): Fix "attempting to index 0 total files" zoekt issue

[brendan-kellam]

Regression was introduced in #483 - the tl;dr is that git init --bare + git fetch leaves HEAD pointing to a non-existent default branch. This hot fix changes it back to use git clone and instead deletes remote.origin.url after cloning.

Fixes #487

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[musabshak]

4.6.6 still has some regression that ends up in some repos consistently erroring out with error:

[backend] | 2025-09-05T20:44:17.357Z error: [repo-manager] Failed to sync repository [gerrit.hostname.com/MyRepo](http://gerrit.hostname.com/MyRepo) (id: 8) after 3 attempts. Error: Error: Failed to fetch repository: /data/.sourcebot/repos/8. Reason: fatal: couldn't find remote ref HEAD
[backend] |

see: #492 @

[brendan-kellam]

4.6.6 still has some regression that ends up in some repos consistently erroring out with error:

[backend] | 2025-09-05T20:44:17.357Z error: [repo-manager] Failed to sync repository [gerrit.hostname.com/MyRepo](http://gerrit.hostname.com/MyRepo) (id: 8) after 3 attempts. Error: Error: Failed to fetch repository: /data/.sourcebot/repos/8. Reason: fatal: couldn't find remote ref HEAD

[backend] |

see: #492 @

Heya - did you happen to upgrade to 4.6.5 prior to 4.6.6? If so, I suspect that maybe those repos have gotten into a bad state where HEAD was not set correctly.

[musabshak]

continuing the discussion here: #492