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Buliding our custom GCC target takes a lot of time (~ 15min each run). Cache the output binary and reuse it as long as the toolchain/gcc and toolchain/binutils directory did not change. Do the same for libc. This reduces the total CI duration from 15min to 1m13s. It will also be possible to re-use our toolchain to test user applications cleanly.
Using nix causes issues with libraries when building newlib using a cached toolchain (classic nix behaviour ...). Stop using nix for this task and install the few required packages manually instead.
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