Database host hardcoded in start.sh

[krumware]

The database host is hardcoded to db:5432 instead of leveraging the environmental variables defined in .env. This prevents the service from properly starting in environments where the service address of the database may not be db.

It is possible to modify to /app/scripts/wait-for-it.sh ${DATABASE_HOST} -- echo "db is up" , after which the default .env can be updated to

DATABASE_HOST=db:5432
DATABASE_URL=postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${POSTGRES_HOST}/${POSTGRES_DB}

This will allow for better runtime configuration in deployed environments.

(will submit PR if this is ok)