fix: handle repos without git gracefully

[BioPhoton]

This error:

Error: fatal: not a git repository (or any of the parent directories): .git

occurred while executing code-pushup code in a MCP server. But in general we should not throw an error if someone executes the tool without git.

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared current commit 6587e4e with previous commit 137392e.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🔴 47	🔴 48
Code coverage	🟢 90	🟢 90
Security	🟡 62	🟡 62	–
Updates	🟡 84	🟡 84	–
Accessibility	🟢 92	🟢 92	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Type Safety	🟢 100	🟢 100	–
Bug prevention	🟢 100	🟢 100	–
Miscellaneous	🟢 100	🟢 100	–
Code style	🟢 100	🟢 100	–
Documentation	🔴 23	🔴 23	–

👍 1 group improved, 👎 1 group regressed, 👍 3 audits improved, 👎 4 audits regressed, 10 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🔴 47	🔴 48
Code coverage	Code coverage metrics	🟢 90	🟢 90

19 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Speed Index	🟥 8.3 s	🟥 6.0 s
Lighthouse	Time to Interactive	🟥 15.9 s	🟥 12.9 s
Lighthouse	Largest Contentful Paint	🟨 3.7 s	🟨 3.9 s
Lighthouse	First Contentful Paint	🟨 2.9 s	🟨 2.9 s
Lighthouse	Total Blocking Time	🟥 7,780 ms	🟥 3,710 ms
Code coverage	Branch coverage	🟨 86 %	🟨 85.9 %
Code coverage	Line coverage	🟨 89.8 %	🟨 89.8 %
Lighthouse	Avoids enormous network payloads	🟩 Total size was 1,838 KiB	🟩 Total size was 1,831 KiB
Lighthouse	Minimizes main-thread work	🟥 22.1 s	🟥 15.1 s
Lighthouse	JavaScript execution time	🟥 10.0 s	🟥 6.5 s
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Max Potential First Input Delay	🟥 3,290 ms	🟥 1,940 ms
Lighthouse	Eliminate render-blocking resources	🟥 Potential savings of 210 ms	🟥 Potential savings of 1,060 ms
Lighthouse	Uses efficient cache policy on static assets	🟨 27 resources found	🟨 27 resources found
Lighthouse	Initial server response time was short	🟩 Root document took 560 ms	🟩 Root document took 380 ms
Lighthouse	Server Backend Latencies	🟩 260 ms	🟩 100 ms
Lighthouse	Network Round Trip Times	🟩 80 ms	🟩 50 ms

586 other audits are unchanged.