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Using GHA caching to store key parts of the testing environment.
One example is downloading
arm-none-eabi-gcc
(which takes roughly 1 minute) for each checkexamples.The rustup setup is roughly 200MB and restores nicely.
Rust examples can be found here
Something to discuss:
Several notable projects remove some problematic files in order to keep cache size reasonable
rust-analyzer
cargo duscussion
tantivity-search
clap-rs