ci: test building demeter image

.github/workflows/main.yml

@@ -14,5 +14,5 @@ jobs:
         with:
           name: liminalos
           # If you chose API tokens for write access OR if you have a private cache
-        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
-    - run: nix build
+      - run: nix build .#demeter --accept-flake-config

flake.nix

@@ -190,4 +190,10 @@
       ];
     };
   };
+
+  nixConfig = {
+    extra-substituters = ["https://liminalos.cachix.org"];
+    extra-trusted-public-keys = ["liminalos.cachix.org-1:GpwgIRFfXwZtZaHA2RPaVGI2ErJKasbb15pkMmQ7dN4="];
+    allow-import-from-derivation = "true";
+  };
 }