Allow password from file

[kapolos]

Feature request: Add a new variable ARANGO_ROOT_PASSWORD_FILE that allows for the password to be passed in as a file.

Reason: Enables better secrets management by orchestration tools.

Example of others doing it: The official MySQL docker image.

The change should be as simple as adding

		if [ -f "$ARANGO_ROOT_PASSWORD_FILE" ]; then
			ARANGO_ROOT_PASSWORD="$(cat $ARANGO_ROOT_PASSWORD_FILE)"
		fi

immediately before: https://github.com/arangodb/arangodb-docker/blob/official/docker-entrypoint.sh#L41

[dothebart]

Sorry - for some reason I've overlooked this. It will be part of the arangodb 3.1.21 release in the next weeks.

[dothebart]

Its merged - so a new 3.1.20 docker image will contain this feature.

[rm-rf-etc]

Need to add this to the documentation, and should be mentioned in the docker hub readme