devenv: skip the cache warning if the requested substituters are already configured #1610
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If devenv cannot configure the requested caches, it displays instructions to either become a trusted user or to set up the caches globally. However, it never checks if the caches are actually configured, so the only solution is to set
cachix.enable = false;
, which can get tedious across many projects.This PR queries Nix to figure out which caches and keys are missing. If the user is not trusted, but all the caches are already configured, no warning is shown.