arthur-tf-sync-repos.yaml: include script directly

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I0d312c4b222297ab0915243ea5608cdcfe33805a
diff --git a/arthur-tf-sync-repos.yaml b/arthur-tf-sync-repos.yaml
index c11f4cb..69488fa 100644
--- a/arthur-tf-sync-repos.yaml
+++ b/arthur-tf-sync-repos.yaml
@@ -12,12 +12,12 @@
         echo "    Gerrit Environment"
         env |grep '^GERRIT'
         echo "########################################################################"
-        mkdir -p ci
-        wget -q https://git.trustedfirmware.org/next/ci/tf-ci-scripts.git/plain/ci/tf-sync-repos.sh -O ci/tf-sync-repos.sh
-        bash ci/tf-sync-repos.sh
+
+    - shell:
+        !include-raw: ci/tf-sync-repos.sh
     properties:
     - build-discarder:
-        num-to-keep: 10
+        num-to-keep: 30
 #    publishers:
 #    - email:
 #        recipients: 'arthur.she@linaro.org'