Add support for running tests w/ database interactions in parallel

[hectcastro]

Support parallel test suite invocations that interact with a database by avoiding the host binding PostgreSQL port 5432. This is particularly noticeable in CI environments that share an instance of Docker.

See: https://github.com/azavea/alimentiv-video-annotation/issues/33

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.