builder: add deeplearning-platform-release project (issue #229)

[jbaldassari]

Similar to the issue/changes described in #192, this adds support for pulling source images from the deeplearning-platform-release project.

Closes #229

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[lbajolet-hashicorp]

Hi @jbaldassari,

Thanks for the PR! I wonder though, I missed that option last time I changed/merged code into the driver regarding the default projects, and if this is a Google official project, I can see us adding it to the list (haven't been able to confirm that unfortunately, would appreciate if you could share a link to the GCE docs if that's the case?), that being said, there's the source_image_project_id argument you can use to specify extra projects to look images from, does that allow you to get the image in the current state?

Just trying to limit the amount of projects we add to our default list, as it is quite rigid to update, and the more projects we add to that list, the slower (potentially) searching for a specific image/image family may become.

That being said the code looks good to me, if there's a compelling reason to add this project to the default list, we should be able to merge this PR, and we have a release planned for next week, so we can definitely fold this in then.

[jbaldassari]

Thanks for the info, @lbajolet-hashicorp ! I'm sorry we missed that source_image_project_id option when we were looking for workarounds. I've confirmed that setting source_image_project_id=deeplearning-platform-release does work for us in this case.

if this is a Google official project, I can see us adding it to the list (haven't been able to confirm that unfortunately, would appreciate if you could share a link to the GCE docs if that's the case?),

I think the confusion here is that these images are part of Deep Learning, which is a Google Cloud product, but these images are not part of GCE itself. The Deep Learning docs reference the deeplearning-platform-release project here and here.

That being said, since we have a workaround, I'll leave it up to you if you want to include this as one of the default projects or recommend people use source_image_project_id for less common cases like this.

[lbajolet-hashicorp]

Don't be sorry @jbaldassari, I also missed it last time when merging the PR you referenced, so there's probably something we can do to make it more visible 😅

I'll keep the PR open for now, and bring that up next time we discuss open issues with the rest of the team, we'll make a decision then.

Thanks for the update, glad source_image_project_id did the trick!