Optional agent key for app installation

[maackle]

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[JettTech]

@maackle - Hey, so I looked into this and it looked like the holochain version needed to be bumped in this version for the tests to test your edit against the issue with the dpki present in the most recent holochain version. So I went ahead and bumped the flake version so the CI could run and show the results with the latest. However, even after the flake is updated, there are several tests that error out with a dpki error, so it appears this edit doesn't cover all the cases.

I went ahead and made another pr (#236) to add a no-dpki flag as a param when creating a new conductor for a local scenario as well as in trycp ones. Can you take a look at that pr when you have a chance? Also, the local conductor setup relies on making a call to hc sandbox, which also did not expose a way to omit/edit the conductor's DpkiConfig so I went ahead a made that change as well, so we could move forward with the DNA testing with this latest version of holochain.

When you get a chance can you please take a look at this tryorama pr and its associated one in holochain?

Thanks so much in advance!! ⚡ 💪