add cache

.gitea/workflows/build.yaml

@@ -0,0 +1,12 @@
+name: checks
+on:
+  push:
+    branches:
+      - main
+jobs:
+  checks:
+    runs-on: nix
+    steps:
+      - uses: actions/checkout@v4
+      - run: attic login pkgs https://attic.scug.io ${{ secrets.ATTIC_TOKEN }}
+      - run: nix-fast-build -- --systems "x86_64-linux aarch64-linux" --no-nom --attic-cache pkgs