FOUNDRY_CONFIG is used at run time in 4 crates. It is a direct run-time dependency in 2 crates. It's used at build time in 2 crates (1 directly).

Depender (with downloads and own rev deps) FOUNDRY_CONFIG version
2.0K 3 polytone-evm build ^0.2.0
2 forge-fmt ^0.2
arbiter =0.2.0