Show shields.io badges

[alexeagle]

Split out from #29 which is related but not the same.

I made https://bazel-contrib.github.io/bazel-catalog/ as a stab at showing adoption numbers. According to the Bazel team's policy, the bcr-ui can only use the data in bazel-central-registry and not store any ancillary data or "curated recommendations", which is why bazel-catalog exists.

However, things like number of stars/forks and download count are objective data we could easily show for anything in the bcr that has a GitHub or GitLab repo, and would be pretty trivial to add.

WDYT @hobofan ?

[hobofan]

You mean rather than building something that collects stars/downloads per repo, using shields.io badges to display those stats?

The only potential problem I see with that is that it would run via a different domain/host, opening up some privacy concerns (which Github itself mitigates by using proxies for the badges). I personally wouldn't have a problem with that, but I'm not sure what the opinions in the wider community are regarding that.

[alexeagle]

It's a valid concern. Since our site is already served by GitHub Pages, I wonder if we can use that same Github proxy to serve these requests?

[alexeagle]

I see that https://github.com/badges/shields/blob/master/README.md itself is requesting
https://camo.githubusercontent.com/68c67639481bf7ac593d62dbff15e2909a6dc819bb75e86233336343a72d5580/68747470733a2f2f696d672e736869656c64732e696f2f6769746875622f636f6e7472696275746f72732f6261646765732f736869656c6473
which uses https://github.com/atmos/camo but that repo is now archived.

From a bit of research I'm skeptical that we can produce these camo URLs https://stackoverflow.com/questions/73666498/how-do-i-generate-the-github-camo-url-for-an-image-used-in-a-github-wiki

From the documentation https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/about-anonymized-urls I can't see any indication this is supported in the Jekyll renderer that GitHub Pages is using.