Add testing as a check for db_management before push

[kayernyc]

When an engineer makes changes in the db_management app, before he/she pushes a change, all tests should run and pass to ensure changes don't break hydration logic.

AC:

• pushing a change triggers running the test suite and blocks the push if the tests fail.
• if a change is successfully pushed, the test suite is run in Github to prevent regressions.