docker-compose.with_db.yml healthchecks fail out of the box

[Brutus5000]

The postgres database in docker-compose.with_db.yml fails to startup by default.

The error for that is that the POSTGRES_USER is not available for the healtcheck via pg_isready, because compose does not lookup the environment variables of a service. Unless it is specifically declared in an .env file it fails to run. And since everything depends on the postgres db, the whole stack fails to launch.

ebicsbox/docker-compose.with_db.yml

Lines 15 to 46 in 6ca2cec

	db:
	image: postgres
	restart: always
	# set shared memory limit when using docker-compose
	shm_size: 128mb
	environment:
	- POSTGRES_DB=ebicsbox
	- POSTGRES_USER=ebicsbox
	- POSTGRES_PASSWORD=password
	networks:
	- ebicsbox_network
	healthcheck:
	test: ["CMD-SHELL", "pg_isready -U $POSTGRES_USER"]
	interval: 10s
	timeout: 5s
	retries: 5
	db_test:
	image: postgres
	restart: always
	# set shared memory limit when using docker-compose
	shm_size: 128mb
	environment:
	- POSTGRES_DB=ebicsbox_test
	- POSTGRES_USER=ebicsbox_test
	- POSTGRES_PASSWORD=password
	networks:
	- ebicsbox_network
	healthcheck:
	test: ["CMD-SHELL", "pg_isready -U $POSTGRES_USER"]
	interval: 10s
	timeout: 5s
	retries: 5

Potential solution: move the default environment to .env.example and mention to copy the file to .env in the readme.