Fix Docker Compose for GitHub Actions

[gabalafou]

I think our test-conda-store-ui job is failing because we try to run docker-compose but GitHub recently started removing v1 of Docker Compose, so we should run the v2 command, which is without the hyphen now:

docker compose

[gabalafou]

Possibly related to CI failure on #401.

I think there were actually two issues with #401. I think that the yarn.lock file I was generating locally did not match the lock file generated on CI, and then on top of that, I think it was failing because of this Docker Compose issue.