re-add nix checks

.woodpecker/test.yml

@@ -4,12 +4,10 @@ pipeline:
     image: nixpkgs/nix-flakes:latest
     pull: true
     commands:
-      - mkdir -p ~/.config/nix
-      - echo "store = /var/build-nix-store" >> /etc/nix/nix.conf
-      - echo "sandbox = false" >>  /etc/nix/nix.conf      
-      - cat /etc/nix/nix.conf
       - time nix flake metadata
       - time nix --no-sandbox develop -c statix check
       - time nix flake check
-    volumes:
-      - /var/lib/woodpecker/nix-store:/var/build-nix-store
+      - export AWS_ACCESS_KEY_ID="nix-builder"
+      - export AWS_SECRET_ACCESS_KEY="$MINIO_NIX_BUILDER_KEY"
+      - nix copy --all --to 's3://nix-store?endpoint=objects.cyplo.dev&scheme=https&region=cyplodev'
+    secrets: [ minio_nix_builder_key ]