remove x86_64-darwin CI

Author: zowoq

docs/continuous-integration.md

@@ -2,12 +2,11 @@ We provide CI for these platforms:
 
 - `aarch64-darwin`
 - `aarch64-linux`
-- `x86_64-darwin`
 - `x86_64-linux`
 
 Both `aarch64-linux` and `x86_64-linux` have support for `kvm`/`nixos-test`.
 
-We only have limited build capacity for `*-darwin` so please don't use it excessively.
+We only have limited build capacity for `aarch64-darwin` so please don't use it excessively.
 
 See [here](./infrastructure.md#continuous-integration) for details about the hardware.
 

hosts/darwin02/default.nix

@@ -12,7 +12,6 @@
   nixCommunity.darwin.ipv6 = "2a01:4f8:d1:5715::2 64 2a01:4f8:d1:5715::1";
 
   nix.settings.sandbox = "relaxed";
-  nix.settings.extra-platforms = [ "x86_64-darwin" ];
 
   # disable nixos-tests
   nix.settings.system-features = [ "big-parallel" ];