feat(cache): Compression for repository cache

[zharinov]

Changes

• Compress repo cache data with snappy algorithm
• Migrate from previous revisions

Context

• Ref: Store PR cache in minimal/transformed form #15275

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[zharinov]

Compression rate is about x4

[viceice]

what about buildin zlib?
https://nodejs.org/api/zlib.html

[viceice]

or pure js snappy

https://github.com/zhipeng-jia/snappyjs

[zharinov]

In this case, I think it makes sense to stick to built-in gzip

[zharinov]

My primary objective was to prefer speed over compression rate, but pure JS implementation is twice slower anyway

[zharinov]

For Brotli algorithm, compression rate is x8. Also I've added check that would short-circuit if the data isn't changed.

[viceice]

otherwise LGTM.

can you check that the new code and also tests are null safe?

[renovate-release]

🎉 This PR is included in version 32.31.0 🎉

The release is available on:

• GitHub release
• 32.31.0

Your semantic-release bot 📦🚀