add devchecks agg job, update hydra config

Signed-off-by: ahuston-0 <aliceghuston@gmail.com>

hydra/jobs.nix

@@ -15,4 +15,13 @@ rec {
     name = "hosts";
     constituents = mapAttrsToList hostToAgg host;
   };
+
+  devChecks = pkgs.releaseTools.aggregate {
+    name = "devChecks";
+    constituents = [
+      formatter
+      devShells
+      checks
+    ];
+  };
 }

systems/palatine-hill/hydra.nix

@@ -57,7 +57,16 @@ in
         </git-input>
         <githubstatus>
           # check hosts and any declared checks
-          jobs = (build-fork-hydra):pr-.*:(hosts|checks.*)
+          jobs = (build-fork-hydra):pr-.*:hosts
+          context = ci/hydra: hosts
+          inputs = nixexpr
+          useShortContext = true
+          excludeBuildFromContext = 1
+        </githubstatus>
+        <githubstatus>
+          # check hosts and any declared checks
+          jobs = (build-fork-hydra):pr-.*:devChecks
+          context = ci/hydra: checks
           inputs = nixexpr
           useShortContext = true
           excludeBuildFromContext = 1