fix: replace hardcoded developer git path with dynamic repo root (fixes #111)

[charlesaurav13]

Summary

The upgrade flow contained a hardcoded path to the original developer's local machine:

'--git-dir=/home/user/sandbox/buskill-app/.git'

This caused fatal: not a git repository on every system other than the developer's, crashing the upgrade flow whenever SOURCE_DATE_EPOCH was not set (i.e. in development / testing builds).

Changes

Replace the hardcoded path with one derived dynamically from __file__:

# before
result = subprocess.run( [
 'git',
 '--git-dir=/home/user/sandbox/buskill-app/.git',
 'log', '-1', '--pretty=%ct'
], capture_output = True )

# after
repo_root = os.path.abspath(
 os.path.join( os.path.dirname(__file__), '..', '..', '..' )
)
result = subprocess.run( [
 'git', '-C', repo_root,
 'log', '-1', '--pretty=%ct'
], capture_output = True )

buskill/__init__.py lives at src/packages/buskill/__init__.py, so 3 directories up is always the repo root. Using git -C rather than --git-dir means it works regardless of the current working directory.

Test plan

• Run upgrade check in a development build (no SOURCE_DATE_EPOCH) — no longer crashes with fatal: not a git repository
• Verify SOURCE_DATE_EPOCH is correctly populated from git log output

Closes #111

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[maltfield]

Thanks for the PR :)

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