[WIP] CP-28572 docker compose file to run w/ ecosystem_database_app

[dlebauer]

• added PG* environment variables to change default schema and port
• maybe this file should go in https://github.com/indigo-ag/ecosystem-observation-database ???

I think to test it out:

## start the database
docker-compose -p bety up -d postgres

## start the web app w/ docker db (currently works)
docker-compose -f docker-compose.indigo.yml -p bety up

## start web app w/ onedb (currently fails, just keeps restarting)
docker-compose -f docker-compose.indigo-onedb.yml -p bety up

here is some data that should populate the database:

demo_inserts.sql.zip