fix(ops/modules/buildkite): merge tags appropriately

Everything was large=true and then nothing was small=true and did not
have a hostname.

This is fixed.

Change-Id: Id90e6246f9ab44ce020d999e975dd8b4cd4492c9
Signed-off-by: Ryan Lahfa <raito@lix.systems>

ops/modules/snix-buildkite.nix

@@ -65,10 +65,12 @@ in
                 export PATH=$PATH:/run/wrappers/bin
               '';
 
-              tags.hostname = hostname;
+              tags = {
-
+                # all agents support small jobs
-              # all agents support small jobs
+                small = "true";
-              tags.small = "true";
+                inherit hostname;
+                large = if n <= cfg.largeSlots then "true" else "false";
+              };
 
               runtimePackages = with pkgs; [
                 bash
@@ -81,10 +83,7 @@ in
                 jq
                 nix
               ];
-            }
+            };
-            // (lib.optionalAttrs (n <= cfg.largeSlots) {
-              tags.large = "true";
-            });
         })
         agents
     );