ci: setup for detect flake config

Author: blaggacao

.github/workflows/cicd.yml

@@ -251,13 +251,31 @@ jobs:
           stat ~/.cache/nix/test-path
           nix-store --verify-path ~/.cache/nix/test-path
 
+  test-nix-config-eval:
+    needs: build
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/download-artifact@v3
+        id: nix-archives
+        with:
+          name: nix-archives-${{ runner.os }}
+      - uses: ./
+        with:
+          nix_archives_url: file://${{steps.nix-archives.outputs.download-path}}
+      - name: Verify Nix config
+        run: |
+          nix build --version # check if new style command is enabled
+          nix show-config | grep -q 'stalled-download-timeout = 333'
+
   release:
     runs-on: ubuntu-latest
     needs:
       - build
       - test
       - test-cachix
       - test-overwrite-nix-dir
+      - test-nix-config-eval
     if: github.event_name == 'push' && github.ref == 'refs/heads/master'
     steps:
       - uses: actions/checkout@v3

flake.nix

@@ -15,6 +15,12 @@
     nixpkgs-nix-2_0_4.flake = false;
   };
 
+  nixConfig = {
+    # We set some dummy Nix config here so we can use it for verification in our
+    # CI test
+    stalled-download-timeout = 333; # default 300
+  };
+
   outputs = {
     self,
     flake-utils,