Adding all that is needed to run this at ASTRON behind raefik.

Adding the .env file to gitignore

Edits to run esap-db behind Traefik

 - Adding Traefik network
 - Adding Traefik labels
 - Adding root-dir to uvicorn command

Removing unused variable definition

To prevent confusion

Made the extenality of the traefik network configurable

This makes it possible to test the setup without an existing network

Automatically create traefik network for testing.

Adding the traefik external network flag to the .env doc

Added quites around false in CI variable