feat(ci): allow refs without shas, fetch if needed

[matejchalk]

Should unblock GitHub Action release (currently fails in code-pushup/github-action#145).

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared current commit 6dcd79d with previous commit 61b7ba4.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🟡 52	🔴 49
Code coverage	🟢 90	🟢 91
Documentation	🔴 23	🔴 23
Security	🟡 75	🟡 75	–
Updates	🟡 77	🟡 77	–
Accessibility	🟢 92	🟢 92	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Bug prevention	🟢 100	🟢 100	–
Code style	🟢 100	🟢 100	–

👍 1 group improved, 👎 2 groups regressed, 👍 3 audits improved, 👎 7 audits regressed, 11 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🟡 52	🔴 49
Code coverage	Code coverage metrics	🟢 90	🟢 91
JSDoc coverage	Documentation coverage	🔴 23	🔴 23

15 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Speed Index	🟨 5.3 s	🟥 6.6 s
Lighthouse	First Contentful Paint	🟨 2.8 s	🟨 2.9 s
Lighthouse	Total Blocking Time	🟥 2,900 ms	🟥 6,020 ms
Lighthouse	Time to Interactive	🟥 13.4 s	🟥 14.9 s
Lighthouse	Largest Contentful Paint	🟨 3.7 s	🟨 3.6 s
JSDoc coverage	Types coverage	🟥 208 undocumented types	🟥 209 undocumented types
JSDoc coverage	Functions coverage	🟥 448 undocumented functions	🟥 450 undocumented functions
Code coverage	Line coverage	🟨 89.9 %	🟨 89.9 %
Code coverage	Branch coverage	🟨 86 %	🟨 86 %
Code coverage	Function coverage	🟩 92.8 %	🟩 92.8 %
Lighthouse	Minimizes main-thread work	🟥 12.6 s	🟥 19.5 s
Lighthouse	Avoids enormous network payloads	🟩 Total size was 1,824 KiB	🟩 Total size was 1,828 KiB
Lighthouse	JavaScript execution time	🟥 6.1 s	🟥 8.6 s
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Max Potential First Input Delay	🟥 1,500 ms	🟥 2,560 ms
Lighthouse	Uses efficient cache policy on static assets	🟨 27 resources found	🟨 27 resources found
Lighthouse	Eliminate render-blocking resources	🟥 Potential savings of 790 ms	🟥 Potential savings of 530 ms
Lighthouse	Reduce unused CSS	🟥 Potential savings of 52 KiB	🟥 Potential savings of 67 KiB
Lighthouse	Server Backend Latencies	🟩 160 ms	🟩 230 ms
Lighthouse	Initial server response time was short	🟩 Root document took 560 ms	🟩 Root document took 570 ms
Lighthouse	Network Round Trip Times	🟩 70 ms	🟩 70 ms

575 other audits are unchanged.