workflow: use attic

.github/workflows/build-packages.yml

@@ -6,6 +6,17 @@ on:
         description: "package to build"
         required: false
         type: string
+env:
+  ATTIC_TOKEN: ${{ secrets.ATTIC_TOKEN }}
+  NIX_CONFIG: |
+    show-trace = true
+    extra-substituters = https://cache.cy7.sh/main
+    extra-trusted-public-keys = main:Ku31HoEWcBtfggge2VGj+QTkVrQuIwRIMGyfV/5VQP0=
+    experimental-features = nix-command flakes
+    extra-experimental-features = nix-command flakes
+    accept-flake-config = true
+  TERM: ansi
+
 jobs:
   build-packages:
     strategy:
@@ -18,6 +29,7 @@ jobs:
           - ubuntu-24.04-arm
           - macos-latest
           - macos-13
+
     runs-on: ${{ matrix.os }}
     steps:
       - name: Install Nix
@@ -27,12 +39,26 @@ jobs:
         uses: actions/checkout@v4
         with:
           persist-credentials: false
-
-      - uses: cachix/cachix-action@v14
-        with:
-          name: cything
-          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-          useDaemon: false
-          installCommand: nix profile install nixpkgs#cachix
+          
+      - name: setup attic
+        run: |
+          nix profile install github:zhaofengli/attic
+          attic login cy7 https://cache.cy7.sh "$ATTIC_TOKEN"
 
       - run: nix build -L ${{ matrix.package }}
+      
+      - name: cache result
+        run: |
+          derivation="$(nix path-info --derivation "${{ matrix.package }}")"
+          cache="$(nix-store --query --requisites --include-outputs "$derivation")"
+          attic push main --stdin <<< "$cache"
+
+      - name: prepare tarball to upload
+        run: nix run github:nixos/nixpkgs#gnutar hcvf result.tar result
+
+      - name: upload result
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.os }}
+          path: result.tar
+          if-no-files-found: error