Update CI to Xcode 10 about bucksample HOT 8 CLOSED

We use CircleCI for most of our iOS things, for open source projects they should give you 1x concurrency for free if you contact them (https://circleci.com/pricing/#faq-section-os-x), not sure if they hold you to the build limits or not.

https://circle-macos-docs.s3.amazonaws.com/image-manifest/build-594/index.html shows that their recent images do still have Java 8; I checked and confirmed that too.

Feel free to reach out to me on Slack/Twitter/email/whatever, I could help some with this

from bucksample.

Fixed by #108

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Travis CI's Xcode 10 machines don't have Java 8, which is required by Buck. (travis-ci/travis-ci#10307)

Not sure if we can switch to another CI vendor.

from bucksample.

Maybe CircleCI is worth looking into? They’re another big player in the space

from bucksample.

This sounds promising. We met up last week and decided we're going to try CircleCI as our next step.

Thanks for investigating if they have Java 8 👍

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(@shepting and @qyang-nj's team are owning this, so I will let them coordinate if they think there are parallelizable tasks 👌)

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The biggest issue we run into with CircleCI is that we saturate the available disk space on their images really easily. Might throw something in the Buck Slack to work on cache sizes. Should be fine for the example app though, as long as your cache is like < 10GB and/or you're not copying a bunch of built products to simulators in the same run it's enough

from bucksample.

Ah I see. Should be enough for this repo, I hope.

from bucksample.