add nix store volume

.woodpecker.yml

@@ -6,6 +6,8 @@ steps:
       - echo "system-features = nixos-test benchmark big-parallel uid-range kvm" > /etc/nix/nix.conf
       - nix build --extra-experimental-features nix-command --extra-experimental-features flakes .#docker
       - cp $(nix build --extra-experimental-features nix-command --extra-experimental-features flakes --print-out-paths .#docker) ./memejoin-rs.tar.gz
+    volumes:
+      - /nix/store:/nix/store
 
   publish-image:
     when:
@@ -20,3 +22,4 @@ steps:
       - 'docker image push git.spacegirl.nl/${CI_REPO}:${CI_COMMIT_TAG}'
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
+      - /nix/store:/nix/store