🌱 Allow tilt provider with pre-build images

[fabriziopandini]

What this PR does / why we need it:
With this PR it is now possible to use tilt providers with probuilt images (images already pushed somewhere, not manage by tilt build_docker_image).

This is useful for test published images, and it came at the cost that for those images it is not possible to activate debud/live reload, which is acceptable for the given use case.

/area devtools

[chrischdi]

Small nits

[chrischdi]

/approve cancel

[chrischdi]

/approve
/lgtm

/hold feel free to unhold

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: d48a414c7e052c62a328e8908a919420e1642ebe

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chrischdi

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[fabriziopandini]

/hold cancel

[sbueringer]

@fabriziopandini Just to confirm. This can be used by not specifying image, live_reload_deps and debug settings (in tilt-settings.yaml) for a provider?

[fabriziopandini]

Yes, if you omit image, then live_reload_deps and debug do not make sense anymore.
But as a clarification, it is also a valid use case to have image and not live_reload_deps and debug (and this was not working before)