schema: add the environments.url column
schema: add the environments.url column

We use this column to store the location of the “environment”, as
generated by the upstream Jenkins.
This will improve this import in the comming Sprints.

Change-Id: I5bf0db16533cce6efa7102338bd8bea6aaec361a

goneri/dci-control-server,enovance/dci-control-server,goneri/dci-control-server,redhat-cip/dci-control-server,enovance/dci-control-server,goneri/dci-control-server,redhat-cip/dci-control-server,goneri/dci-control-server