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Replace `ftp.uk.debian.org` with snapshot links

In https://gitlab.arm.com/bazel/rules_coreutils/-/blob/e96216e184b505716aa865e47b59201bacf9f9d5/MODULE.bazel#L62 and https://gitlab.arm.com/bazel/rules_coreutils/-/blob/e96216e184b505716aa865e47b59201bacf9f9d5/MODULE.bazel#L70 Debian packages are pulled in via a ftp.uk.debian.org domain.

I would propose to change that to https://snapshot.debian.org/archive/debian/20250203T090921Z/pool/main/b/busybox/busybox-static_1.35.0-4%2Bb3_amd64.deb for three reasons:

  • This is not necessarily a mirror in the UK and has the potential of choosing a mirror with closer proximity
  • This is a stable URL that will be around for some time to come
  • This is the same scheme rules_distroless uses

The last one is the actual motivation for this ticket. We are currently in the process of introducing a --experimental_downloader_config to rewrite all external URLs to an internal cache. Would this use the same snapshot URL, the rewriting rules get a little simpler.