Testing instructions

[abigalekim]

Hello, can someone provide instructions for running the test suite, both in Docker and not in Docker? I think as far as I understand, it is:

Test reproducibility steps in Docker: Run Dockerfile?
Test reproducibility steps, not in Docker: Start with a Linux instance. Install dependencies mentioned in Docker file, then set env. variables (e.g. CHECK_CODE) and run the script run_tests.sh.

However, running the steps not in Docker results in a an error that some queries haven't ran prior to me running pg_regress tests, which makes me think there's an init step somewhere that runs queries outside of the pg_regress SQL suite that I haven't figured out.