profiles/core: Add personal cachix cache to the substituters

.github/workflows/check-deploy.yml

@@ -8,6 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       checks: ${{ steps.checks.outputs.checks }}
+      hosts: ${{ steps.hosts.outputs.hosts }}
     steps:
       - uses: actions/checkout@v5
       - uses: cachix/install-nix-action@v31

profiles/core.nix

@@ -41,6 +41,11 @@
 
         min-free = 4 * 1024 * 1024 * 1024;
         max-free = 6 * 1024 * 1024 * 1024;
+
+        substituters = [ "https://sebastian-stork.cachix.org" ];
+        trusted-public-keys = [
+          "sebastian-stork.cachix.org-1:PAgwmtq5BF/UlUoXdBC2sX2EKZQ2vCjo3iGySujbaME="
+        ];
       };
     };