Fix CI failures due to Horovod and MPI dependencies

[awaelchli]

What does this PR do?

Tries to fix #12314

Does your PR introduce any breaking changes? If yes, please list them.

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[Borda]

Seems to be parallel effort with #12318

[awaelchli]

@Borda How do you force the GPU CI to use the changed docker build?

[Borda]

@Borda How do you force the GPU CI to use the changed docker build?

No, because it doesn't compile correctly yet...

[carmocca]

This is how you force the Docker images to get rebuilt and pushed to dockerhub:

cd83dd1

After they finish, you revert the above commit and CI should pull the image you just generated.

[mathemusician]

👀

[awaelchli]

My idea of including missing mpi libs did not work.

[mathemusician]

“You think I’ll weep?
No, I’ll not weep. Storm and tempest.”

[carmocca]

Isn't this part of the problem?