As per T362425: ForeignResourceStructureTest flaky in CI due to "Failed to download resource at https://codeload.github.com" and T362095: "composer install" flaky in CI due to "Failed to connect to github.com port 443: Connection timed out", our CI, especially for MediaWiki heavily depends on GitHub. This is partly due to Composer and partly due to more specific dependancies in npm related packages (validated as part of foreign-resources.yaml), which often in turn have their canonical repositories on GitHub, meaning we load things from there.

Numerous jobs repeatedly failing is not helpful to Developer Productivity!

While fixes like rCICFe0982e0c4573: dockerfiles: [composer-php70] Inject GitHub OAuth token into composer runtime for T106452: Composer activity from Cloud VPS hosts can be rate limited by GitHub and T248387: Could not authenticate against github.com have helped, we still regularly enough experience issues that are very much outside our control, and do not even correlate with GitHub service outages, for example.