fix: create instance from custom image

[edlerd]

Done

• fix instance creation from custom images: needs fingerprint in payload.source

QA

1. Run the LXD-UI:
   • On the demo server via the link posted by @webteam-app below. This is only available for PRs created by collaborators of the repo. Ask @mas-who or @edlerd for access.
   • With a local copy of this branch, run as described here.
2. Perform the following QA steps:
   • create a custom image locally as described in Avoid null pointer exception on custom images #717
   • launch an instance from the custom image, where previously an error was encountered as described here, the instance should now be created.

[webteam-app]

Demo

Jenkins

demos.haus

[edlerd]

This should fix the underlying issue. Created a ticket to cover this with an e2e test in the future.

[mas-who]

LGTM 👍