disallow login instead of automatically granting viewer permission

Author: soerenschneider

apps/grafana/components/oidc/grafana.properties

@@ -4,4 +4,4 @@ GF_AUTH_GENERIC_OAUTH_ALLOW_SIGN_UP=true
 GF_AUTH_GENERIC_OAUTH_SCOPES=openid email profile offline_access roles
 GF_AUTH_GENERIC_OAUTH_EMAIL_ATTRIBUTE_PATH=email
 GF_AUTH_GENERIC_OAUTH_LOGIN_ATTRIBUTE_PATH=username
-GF_AUTH_GENERIC_OAUTH_ROLE_ATTRIBUTE_PATH=contains(roles[*], 'admin') && 'Admin' || contains(roles[*], 'editor') && 'Editor' || 'Viewer'
+GF_AUTH_GENERIC_OAUTH_ROLE_ATTRIBUTE_PATH=contains(roles[*], 'admin') && 'Admin' || contains(roles[*], 'editor') && 'Editor' || contains(roles[*], 'viewer') && 'Viewer' || 'false'