Link the default Apache directory to the Nextcloud server in all runners

Link the default Apache directory to the Nextcloud server in all runners

In order to run the acceptance tests in Apache "/var/www/html" has to be
linked to the root directory of the Nextcloud server. Before this was
automatically done when launching the acceptance tests through
"./run.sh", but an explicit command was needed when run in Drone. Now
the linking was moved from "run.sh" to "run-local.sh", so it is
automatically done when run through "./run.sh" and in Drone, including
when running the tests for an app instead of for the server.

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>