tf-a-weekly.yaml: Adding weekly run

    Adding a weekly run to accommodate jobs that are too large
for the daily but can be invoked less often.  Will start with
coverage and then possibly expand to other requirements over
time.

Change-Id: I7f13aa92e6da52a8bac3eee89b5bdc1764f2cc0d
Signed-off-by: Mark Dykes <mark.dykes@arm.com>
2 files changed