WIP: Update CircleCI config to version 2.

[technomancy]

The circle.yml file in the repository was based on the old CircleCI 1.0 which was shut down several years ago.

I've updated the config to CircleCI 2.0. However, the build is still failing:
https://app.circleci.com/pipelines/github/technomancy/clj-pdf/6/workflows/25041072-6025-49ef-ba8c-9572c2ca2e9f/jobs/7

It's unclear to me what the root cause of the failures are.

[yogthos]

Thanks, and I think the problem is that the tests are sensitive to the fonts available in the environment. So, an image with different fonts installed would break the tests.

[yogthos]

There's a generate-test-pdfs helper that needs to be run once for the new environment.

[technomancy]

I see; thanks. So to be clear, are you saying that the test PDFs should specifically be regenerated in order to get the CI passing? Wouldn't that cause the tests to start failing on whatever machine they're currently passing on?

[technomancy]

Would it be possible for the repository itself to include the fonts that are required for the tests to pass?

[yogthos]

Yeah, I've been meaning to revisit this at some point to see what could be done to make this environment agnostic. A quick fix might be to just run tests in a container locally to have consistent environment.