ci/check: move matrix output

.github/workflows/check.yml

@@ -27,7 +27,7 @@ jobs:
         id: set-matrix
         run: |
           set -Eeu
-          matrix=$(nix eval --json .#githubActions.matrix)
+          matrix=$(nix eval --json .#githubActions.checksMatrix)
           echo "matrix=$matrix" >> "$GITHUB_OUTPUT"
 
   build:
@@ -37,8 +37,7 @@ jobs:
       - prepare
     strategy:
       fail-fast: false
-      matrix:
-        include: ${{ fromJSON(needs.prepare.outputs.matrix) }}
+      matrix: ${{ fromJSON(needs.prepare.outputs.matrix) }}
     secrets: inherit
     with:
       systemAsName: true

flake/dev/tests.nix

@@ -14,7 +14,7 @@
     };
 
   # Output a build matrix for CI
-  flake.githubActions.matrix =
+  flake.githubActions =
     let
       systemsByPrio = [
         "x86_64-linux"
@@ -41,8 +41,8 @@
           ) (throw "No supported system found!") systemsByPrio;
         in
         toGithubBuild system;
-    in
-    lib.pipe self.checks [
+
+      checks = lib.pipe self.checks [
         (lib.mapAttrsRecursiveCond (x: !lib.isDerivation x) (
           loc: _: {
             _type = "check";
@@ -75,4 +75,8 @@
           }
         ))
       ];
+    in
+    {
+      checksMatrix.include = checks;
+    };
 }