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fix
cachix: CppStdException "Exception: path '/nix/store/... ' is not valid; type: nix::InvalidPath"
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don't error out if signing key is missing (typical on pull requests)
fix cachix: CppStdException "Exception: path '/nix/store/... ' is not valid; type: nix::InvalidPath"
don't error out if signing key is missing (typical on pull requests)