workflow updates

.forgejo/workflows/ci.yaml

@@ -5,13 +5,12 @@ on:
 
 jobs:
   checks:
-    runs-on: ubuntu-latest
+    runs-on: nix
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v26
-      - uses: icewind1991/attic-action@v1
+      - uses: https://codeberg.org/icewind/attic-action@v1
         with:
-          name: ci
-          instance: https://cache.icewind.me
+          name: link
+          instance: https://cache.icewind.link
           authToken: "${{ secrets.ATTIC_TOKEN }}"
       - run: nix flake check --keep-going