tf-a-lts-cleanup: Add timed trigger and remove dry-run

For now, run daily to ensure everything works as expected. Can be made
weekly afterwards.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Iad92a42aba56aed2f20c027022446372976e3ed2
diff --git a/tf-a-lts-cleanup.yaml b/tf-a-lts-cleanup.yaml
index a4e888e..d663c7a 100644
--- a/tf-a-lts-cleanup.yaml
+++ b/tf-a-lts-cleanup.yaml
@@ -11,6 +11,8 @@
         num-to-keep: 30
     - authorization:
         !include: authorization.yaml.inc
+    triggers:
+        - timed: 'H 3 * * *'
     wrappers:
         - credentials-binding:
           - ssh-user-private-key:
@@ -30,7 +32,7 @@
 
             git clone https://git.trustedfirmware.org/ci/tf-a-ci-scripts.git
             cd tf-a-ci-scripts/lts
-            ./lts-cleanup-sandbox-refs.py --dry-run --user $CI_BOT_USERNAME --limit 1
+            ./lts-cleanup-sandbox-refs.py --user $CI_BOT_USERNAME --limit 1
     publishers:
         - email:
             recipients: 'paul.sokolovsky@linaro.org'