add: cachix action

Author: blaggacao

.github/workflows/check.yml

@@ -3,7 +3,7 @@ name: "Check & Cachix"
 on:
   push:
     branches:
-      - core
+      - main
       - trying
       - staging
 
@@ -23,6 +23,12 @@ jobs:
           substituters = https://nrdxp.cachix.org https://nix-community.cachix.org https://cache.nixos.org
           trusted-public-keys = nrdxp.cachix.org-1:Fc5PSqY2Jm1TrWfm88l6cvGWwz3s93c6IOifQWnhNW4= nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
 
+    - uses: cachix/cachix-action@v10
+      with:
+        name: nrdxp
+        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
+        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+
     # Quick eval
     - run: nix develop --command evalnix