treewide: rationalise distributed builds

hosts/kalessin/default.nix

@@ -22,12 +22,10 @@ in
   qenya.services.remote-builder = {
     enable = true;
     authorizedKeys.keys = [
+      keys.machines.kilgharrah
       keys.machines.tohru
-      keys.machines.yevaud
-      keys.machines.orm
     ];
   };
-  boot.binfmt.emulatedSystems = [ "x86_64-linux" ];
 
   system.stateVersion = "23.11";
 }

hosts/kilgharrah/default.nix

@@ -40,11 +40,12 @@ in
 
   qenya.services.remote-builder = {
     enable = true;
-    authorizedKeys.keys = [
-      keys.machines.tohru
-      keys.machines.yevaud
-      keys.machines.orm
-    ];
+    authorizedKeys.keys = [ keys.machines.tohru ];
+  };
+  qenya.services.distributed-builds = {
+    enable = true;
+    keyFile = "/etc/ssh/ssh_host_ed25519_key";
+    builders = [ "kalessin" ];
   };
 
   programs.steam.enable = true;

hosts/orm/default.nix

@@ -14,12 +14,6 @@
   users.users.qenya.extraGroups = [ "wheel" ];
   qenya.base-server.enable = true;
 
-  qenya.services.distributed-builds = {
-    enable = true;
-    keyFile = "/etc/ssh/ssh_host_ed25519_key";
-    builders = [ "kalessin" ];
-  };
-
   randomcat.services.zfs.datasets = {
     "rpool_orm/state" = { mountpoint = "none"; };
     "rpool_orm/state/actual" = { mountpoint = "/var/lib/actual"; };

hosts/tohru/default.nix

@@ -49,7 +49,7 @@
   qenya.services.distributed-builds = {
     enable = true;
     keyFile = "/etc/ssh/ssh_host_ed25519_key";
-    builders = [ "kalessin" ];
+    builders = [ "kilgharrah" "kalessin" ];
   };
 
   programs.evolution.enable = true; # not in home-manager yet; not declaratively configurable yet

hosts/yevaud/default.nix

@@ -14,12 +14,6 @@
   users.users.qenya.extraGroups = [ "wheel" ];
   qenya.base-server.enable = true;
 
-  qenya.services.distributed-builds = {
-    enable = true;
-    keyFile = "/etc/ssh/ssh_host_ed25519_key";
-    builders = [ "kalessin" ];
-  };
-
   services.bind = {
     # enable = true;
     cacheNetworks = [ "10.127.0.0/16" "fd70:81ca:0f8f::/48" ];