Avoid rate-limiting issues when retrieving remote PEtab problems

[dweindl]

Since a couple of days or weeks, we are frequently running into rate-limiting issues when downloading PEtab problems from https://raw.githubusercontent.com/ leading to test failures (e.g., https://github.com/AMICI-dev/AMICI/actions/runs/15093799099/job/42425779408).

Cloning the full repository would be an alternative, but sometimes it would be more convenient to only access the relevant files. See also Benchmarking-Initiative/Benchmark-Models-PEtab#264. An alternative might be adding some delay for retrieving the individual PEtab files in libpetab.

[FFroehlich]

https://github.com/orgs/community/discussions/159123, https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api?apiVersion=2022-11-28

[dweindl]

Ah, yeah, https://github.blog/changelog/2025-05-08-updated-rate-limits-for-unauthenticated-requests/ is the relevant update.

The documentation doesn't make it immediately clear to me how the rate-limit for https://raw.githubusercontent.com/ can be circumvented, though. We're not using the GitHub REST API.

[dweindl]

From my understanding, gh-pages is not subject to any relevant rate-limiting, so just deploying the working tree should be the simplest solution for now.