Prometheus Reverse Proxy

[pbelmann]

I believe that the reverse proxy domain setting should be configurable by a variable in .portal.env

project_usage/prod/docker-compose.portal.override.yml

Lines 9 to 13 in 28e648d

	# command:
	# - --web.external-url=https://portal-dev.denbi.de/prom
	# But if you do so also uncomment the following, since using command line
	# arguments seems to change the default location of the config file
	# - --config.file=/etc/prometheus/prometheus.yml