build: configure secondary mirror fallback#3814
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Currently, transient GitHub network issues can cause builds to fail when pulling platforms. To fix, configure Bazel's downloader to try GitHub first and fall back to mirror.bazel.build.
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This pull request configures an experimental downloader configuration in .bazelrc and adds rewrite rules in downloader_config.cfg to handle fallbacks for Bazel platforms. The review feedback correctly points out that the regular expressions used for rewriting URLs are unanchored and contain unescaped dots, which could lead to unexpected matching behavior, and provides a robust alternative.
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Currently, transient GitHub network issues can cause builds to fail
when pulling platforms.
To fix, configure Bazel's downloader to try GitHub first and fall back
to mirror.bazel.build.