flake.nix: use crane's toolchains for crane builds

flake.nix

@@ -64,12 +64,12 @@
         ])) ./.;
 
       cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
-    in forAllSystems (system: pkgs: toolchain: let
-      craneLib = (crane.mkLib pkgs).overrideToolchain (p: toolchain);
+    in forAllSystems (system: pkgs: _: let
+      craneLib = (crane.mkLib pkgs).overrideToolchain (p: p.rust-bin.stable.latest.default);
     in {
-      default = self.packages.${system}.tamerye-shared-lib;
+      default = self.packages.${system}.tamerye-shared-lib-crane;
 
-      tamerye-shared-lib = craneLib.buildPackage {
+      tamerye-shared-lib-crane = craneLib.buildPackage {
         pname = "tamerye-shared-lib";
         version = cargoToml.package.version;
         inherit src;
@@ -83,7 +83,7 @@
         };
       };
 
-      tamerye-static-lib = craneLib.buildPackage {
+      tamerye-static-lib-crane = craneLib.buildPackage {
         pname = "tamerye-static-lib";
         version = cargoToml.package.version;
         inherit src;
@@ -111,7 +111,7 @@
         cargoExtraArgs = lib.escapeShellArgs [ "--features" "static" ];
       };
 
-      tamerye-tests = craneLib.cargoNextest {
+      tamerye-tests-crane = craneLib.cargoNextest {
         pname = "tamerye-tests";
         version = cargoToml.package.version;
         inherit src;