Adds support for Docker Build Cloud

[matthewbjones]

This PR aims to add the minimal amount of code changes to support building using Docker Build Cloud

Although Kamal already currently supports remote builds using remote: ssh://user@ip-address, some individuals or organizations may prefer to use Docker Build Cloud for remote compiling (for example, you don't have a remote machine around to utilize remote builds)

Assuming you're using Docker Build Cloud, and you've already created a builder on your Docker Build Cloud, then, all you need to do with Kamal is specify the driver:

driver: cloud org-name/builder-name

When specifying driver: cloud ..., the buildx commands will now pass in a --builder cloud-org-name-builder-name to instruct buildx to use that builder. It will also automatically register and remove the cloud driver as well.

Related Discussion: #914

[nickhammond]

@alexohre Can you try this PR out for your cloud build?

[matthewbjones]

I believe the build failure is an intermittent failure and should pass if the GitHub Actions were re-ran. I don't see a way to do that myself.

[nickhammond]

@matthewbjones Can we create the build setup automatically? That'll keep it closer in functionality to the remote builder. We'd just need create_buildx and remove_buildx.

https://github.com/basecamp/kamal/blob/main/lib/kamal/commands/builder/remote.rb#L56

[matthewbjones]

@matthewbjones Can we create the build setup automatically? That'll keep it closer in functionality to the remote builder. We'd just need create_buildx and remove_buildx.

https://github.com/basecamp/kamal/blob/main/lib/kamal/commands/builder/remote.rb#L56

Thanks for the suggestion, I've updated the PR to add this functionality.

[alexohre]

@alexohre Can you try this PR out for your cloud build?

Thanks for the update @nickhammond, That's exactly what I've been waiting for all this while.

[nickhammond]

@alexohre All credit goes to @matthewbjones! 🙌

[alexohre]

@nickhammond definitely, a big thanks to @matthewbjones for his exceptional contribution 👏

[djmb]

Looks great @matthewbjones. Just one suggestion and we can get that merged.

[matthewbjones]

@djmb Thanks for the code review and suggestion, I've updated the PR as requested

[matthewbjones]

@djmb all tests passed locally, and passed previously, the slight code update shouldn't have caused test failures. I don't see a way on my end to have GitHub Actions re-run, are you able to do that on your end?

[djmb]

@matthewbjones - I think you just caught some broken tests on main. They are fixed now and I've merged in main, so hopefully that will fix them

[matthewbjones]

@matthewbjones - I think you just caught some broken tests on main. They are fixed now and I've merged in main, so hopefully that will fix them

@djmb Makes sense, thanks! Looks like they all pass now :-)

[alexohre]

I thought this branch had been merged with the main.

I added driver: cloud org-name/builder-name under my builder, but it's not working. Am I missing something?

[nickhammond]

@alexohre It has but a release hasn't been cut yet.

You can point your Gemfile at this repo and then prefix your kamal commands with bundle exec though.

[alexohre]

thanks @nickhammond, it's working now.