* test: add docker-compose where postgres is required
* test: http checks where postgres is required
* test: run docker-compose services if they exist in an example project
* test: remove justBuild from django test
* test: snapshot update
* fix: add PORT with default to django gunicorn start command
* test: add bin/rails
* test: update rails with postgres test to have a valid root route
* docs: integration test documentation
