PINT

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Issue summary

• The CI appears to recompile everything on every PR, ideally we should cache at least all the polkadot/substrate related dependencies.

Other information and links

Already cached with sccache

• https://github.com/ChainSafe/PINT/blob/84acda4f4ff00467d351dc9a8476ef60a40e174e/.circleci/config.yml#L90
• https://github.com/ChainSafe/PINT/blob/84acda4f4ff00467d351dc9a8476ef60a40e174e/.circleci/config.yml#L53

hmm judging from the CI logs, it appears the environment is always set up new and all dependencies installed, but I don't really have much experience with configuring this for optimization.

Caching target directory will cause some related issues, for example

• we remove a feature and related code in one PR
• we get back the feature but forget to get back the related code
• the project still can compile

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• build-cache
• moonbeam also use sccache

Please add your planning poker estimate with ZenHub @clearloop

FYI

• There is a tool for optimizing docker layer caching for rust (see https://github.com/LukeMathWalker/cargo-chef)
• But this only works for local development and circleci docker caching is working poorly. So I would suggest using kaniko cache strategy (see https://github.com/GoogleContainerTools/kaniko#caching), this allows storing cache layers in docker registry.