set GF_SERVER_ROOT_URL as ${PROXY_URL}/visualization/

With the current configuration GF_SERVER_ROOT_URL=%(protocol)s://%(domain)s/visualization/ grafana redirects to localhost for Oauth Login.

This was not a problem for local testing but AAI login did not work on the intranet VM.

Fixed by replacing it with GF_SERVER_ROOT_URL=${PROXY_URL}/visualization/

merged

assigned to @joost.hemmen1

mentioned in commit 75e03ae1