speed up push

.gitea/workflows/check-flake.yaml

@@ -18,19 +18,16 @@ jobs:
       - name: Check Flake
         run: nix flake check --all-systems --print-build-logs --log-format raw --show-trace
 
-      - name: Debug
-        env:
-          ATTIC_ENDPOINT_VAR: ${{ vars.ATTIC_ENDPOINT }}
-          ATTIC_TOKEN_VAR: ${{ secrets.ATTIC_TOKEN }}
-        run: |
-          echo "Endpoint length: ${#ATTIC_ENDPOINT_VAR}"
-          echo "Token length: ${#ATTIC_TOKEN_VAR}"
-
       - name: Push to cache
         env:
           XDG_CONFIG_HOME: ${{ runner.temp }}/.config
         run: |
           attic login local "${{ vars.ATTIC_ENDPOINT }}" "${{ secrets.ATTIC_TOKEN }}"
-          nix eval .#nixosConfigurations --apply 'cs: map (n: "${cs.${n}.config.system.build.toplevel}") (builtins.attrNames cs)' --json \
-            | jq -r '.[]' \
-            | xargs attic push nixos
+          # Get all system toplevel store paths
+          toplevels=$(nix eval .#nixosConfigurations --apply 'cs: map (n: "${cs.${n}.config.system.build.toplevel}") (builtins.attrNames cs)' --json | jq -r '.[]')
+          # Expand to full closures, deduplicate, and filter out paths already
+          # signed by cache.nixos.org — only our custom builds need caching
+          echo "$toplevels" \
+            | xargs nix path-info -r --json \
+            | jq -r '[.[] | select((.signatures // []) | all(startswith("cache.nixos.org") | not)) | .path] | unique[]' \
+            | xargs attic push local:nixos 1>/dev/null