Enable Lighthouse CI App integration for nicer checks display?

[krassowski]

Currently the lighthouse result show up as:

Total size of all the files uploaded is 1165820 bytes
Finished uploading artifact lighthouse-results. Reported size is 1165820 bytes. There were 0 items that failed to upload
Uploading median LHR of http://localhost:45821/about.html...success!
Open the report at https://storage.googleapis.com/lighthouse-infrastructure.appspot.com/reports/1640813497053-27107.report.html
Uploading median LHR of http://localhost:45821/binder.html...success!
Open the report at https://storage.googleapis.com/lighthouse-infrastructure.appspot.com/reports/1640813497456-16487.report.html
Uploading median LHR of http://localhost:45821/community.html...success!
Open the report at https://storage.googleapis.com/lighthouse-infrastructure.appspot.com/reports/1640813497852-78305.report.html
Uploading median LHR of http://localhost:45821/documentation.html...success!
Open the report at https://storage.googleapis.com/lighthouse-infrastructure.appspot.com/reports/1640813498306-7357.report.html
Uploading median LHR of http://localhost:45821/hub.html...success!
Open the report at https://storage.googleapis.com/lighthouse-infrastructure.appspot.com/reports/1640813498846-65386.report.html
No GitHub token set, skipping GitHub status check.
Dumping 5 reports to disk at /home/runner/work/jupyter.github.io/jupyter.github.io/.lighthouseci...
Done writing reports to disk.

Error: 2 results for http://localhost:45821/about.html
Report: https://storage.googleapis.com/lighthouse-infrastructure.appspot.com/reports/1640813497053-27107.report.html

❌ categories.accessibility failure for minScore assertion
Expected >= 0.95, but found 0.94

❌ categories.best-practices failure for minScore assertion
Expected >= 0.95, but found 0.93
Error: 2 results for http://localhost:45821/binder.html
Report: https://storage.googleapis.com/lighthouse-infrastructure.appspot.com/reports/1640813497456-16487.report.html

❌ categories.accessibility failure for minScore assertion
Expected >= 0.95, but found 0.85

❌ categories.seo failure for minScore assertion
Expected >= 0.95, but found 0.92
Error: 1 result for http://localhost:45821/documentation.html
Report: https://storage.googleapis.com/lighthouse-infrastructure.appspot.com/reports/1640813498306-7357.report.html

❌ categories.accessibility failure for minScore assertion
Expected >= 0.95, but found 0.94

But we could go fancy and have:

This would require authorizing https://github.com/apps/lighthouse-ci ; it is tied to a private account of maintainer but also mentioned on https://github.com/GoogleChrome/lighthouse-ci/blob/main/docs/getting-started.md#github-status-checks.

Just an option - I don't have opinion on this one.

Originally posted by @krassowski in #579 (comment)

[HarshCasper]

Hi @krassowski 👋

I had an attempt to work on this! Here is the PR: #692

It would remove the need to have a LightHouse CI App to be installed and the CI workflow can directly put up a comment over the PR.