ci: collect postgresql logs in CI

[tmc]

If we do have an odd failure having postgres logs would be useful.

[mileswilson]

CircleCI already collects the logs from the support containers, please see the screenshot: https://screenshots.firefox.com/IBdqbEGhCZu381v1/circleci.com

Are you after having the logs archived with the test results?

[tmc]

Well here we had a flake and we didn't get very useful output in the pg container: https://circleci.com/gh/tmc/pqstream/298

[empijei]

If you want the logs to be collected together with the test output can't you just edit the bash invocation to the test to "cat" the log files if the command does not exit with 0?

[tmc]

It's running in a separate container.