ci: run race tests through a flake check

.github/workflows/nix-checks.yml

@@ -37,6 +37,16 @@ jobs:
       - name: gotest
         run: nix build -L .#checks.x86_64-linux.gotest
 
+  gorace:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: NixOS/nix-installer-action@62c1943b776c509394b550f3f983adc14e9212d6 # main
+      - uses: Mic92/hestia@dfed9ced335d28978ba74e513939a10db1f71025 # v3.1.0
+      - name: gorace
+        run: nix build -L .#checks.x86_64-linux.gorace
+
   golangci-lint:
     runs-on: ubuntu-latest
     steps: