ci: test exatrkx training ci

[benjaminhuth]

very experimental, all other CIs disabled to save capacity on CI machines

[benjaminhuth]

@paulgessinger @asalzburger I now got a first version of a Exa.TrkX training CI working. However, I think there is still some things to decide how to do this exactely:

1. Include the training code in the acts-project/acts repository
   • Advantage: Simple, CI always in a controlled state
   • Disadvantage: Code not really related to acts code, changes need PRs to repo
2. Create another repo under acts-project and pull this in at CI time
   • Advantage: Separate independent code, more easy to modify
   • Disadvantage: Need to have some kind of versioning there
3. Create another repo under acts-project and run the training CI completely there
   • Advantage: None of the above mentioned disadvantages
   • Disadvantage: How to test the full chain training -> inference in acts (need e.g. specify acts version to build, then changes in acts main branch are not automatically checked)
4. Maybe some option I do not think of...

These are just some thoughts I have regarding this... Not sure wether to discuss this here in the PR or maybe at the developers meeting today?

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