fix(ci): test failure with 'jemallocator'

Author: jpraynaud

flake.nix

@@ -112,8 +112,8 @@
           mithril-client-cli = buildPackage ./mithril-client-cli/Cargo.toml mithril.cargoArtifacts {
             pname = "mithril-client";
           };
-          mithril-aggregator = buildPackage ./mithril-aggregator/Cargo.toml mithril.cargoArtifacts {};
-          mithril-signer = buildPackage ./mithril-signer/Cargo.toml mithril.cargoArtifacts {};
+          mithril-aggregator = buildPackage ./mithril-aggregator/Cargo.toml mithril.cargoArtifacts { cargoTestCommand = "cargo test --no-default-features"; };
+          mithril-signer = buildPackage ./mithril-signer/Cargo.toml mithril.cargoArtifacts { cargoTestCommand = "cargo test --no-default-features"; };
           mithril-persistence = buildPackage ./internal/mithril-persistence/Cargo.toml mithril.cargoArtifacts {};
           mithrildemo = buildPackage ./demo/protocol-demo/Cargo.toml mithril.cargoArtifacts {};
           mithril-end-to-end = buildPackage ./mithril-test-lab/mithril-end-to-end/Cargo.toml null {};