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Use reproducible builds for provider packages (#35693)
Flit allows to build reproducible packages (packages that can be compared bit-by-bit) providing that source date epoch is set to repeatable value when package is built. This PR implements reproducibility of our builds by freezing the documentation preparation time in provider.yaml as "source date epoch" and always using it when building the package. This way anyone using breeze to build the package will have exactly the same binary package produced, which will make it way easier to verify if the packages are ready for release by the PMC member. We will no longer have to check the sources, PMC members will simply need to build the same packages locally using breeze and see if the generated packages are exactly the same. That also includes permissions bits - flit sets permissions of the generated packages to "no permissions for other/group" in order to get bit-to-bit reproducibility - because on some systems umask is set differently by default and created file would be different because of the permission bit. This caused problems when building docker images - so we had it changed when moving packages to 'dist' folder, but this PR changes it so that CI build does it when moving packages from dist to docker-context-files instead The "source-date-epoch" fields have been regenerated in this PR as well. Also this PR replaces `lru_cache` method of storing output of `get_provider_metadata_packages` with custom-stored dictionary - thanks to that instead of invalidating whole cache of providers metadata refreshed from yaml files we can refresh individual provider metadata entries after they have been updated. This saves a lot of time for validation - because every time when provider yaml is updated we need to re-read it and re-validate it with json schema, with this change we only do it for the updated provider yaml - which saves about 0.5 a second per provider yaml update and when you update all provides it is done way faster.
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