build: Add environment.yml for doubletdetection

[edmundmiller]

Follow up to #6897

[SPPearce]

Hey @edmundmiller , what is going on with this PR?

[LeonHafner]

I already had a look at it and tried to fix the container issues but I'm currently lacking time.
I think the problem is that the old seqera container (build page) works, but the new seqera container (build page) seems to have some dependency issues with numpy, despite being built on the same environment file. No idea why it didn't cache but rebuilt it?

The old container uses a different numpy version, but if you set them to a fixed value and build a new container (build page), it will still result in errors, though different ones. The conda environment is facing the same problem as the new containers.

Any ideas how we could rebuild a new container and environment with the exact dependencies used in the old container (the one built 06/2023)?

[edmundmiller]

Per @LeonHafner, the issue is fixed, so we can merge this. It's just failing #5814