Move to Circle CI 2.0

[MartinDelille]

Since Circle CI 1.0 sunset in august.

[philsturgeon]

The most important aspect of CircleCI 2.0 is workflows, but their basing everything around docker images is also going to be very relevant here.

Workflows will allow you to run your various different test suites simultaniously, without needing multiple different CI services involved.

There are pre-built images for all sorts of things, so hopefully many of your needs will be satisfied with those, and you wont need to go building custom images.

Here is a very boring CicleCI config with only the one workflow, but it might help:

https://github.com/wework/speccy/blob/master/.circleci/config.yml

[wing328]

@MartinDelille thanks for creating an issue for tracking

@philsturgeon thanks for sharing more about new features in CircleCI 2.0. We'll explore CircleCI 2.0 new features (e.g. custom build images) after the migration.

[wing328]

UPDATE: https://discuss.circleci.com/t/issue-with-migration-from-1-0-to-2-0/22915