tf-sync-github-repos: include script directly in the job

The URL for the script has changed.
Include the script directly to prevent the error happens again.

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: If48a21aeea2eaa86540ac3a5edb43cd9c544e8f8
diff --git a/tf-sync-github-repos.yaml b/tf-sync-github-repos.yaml
index a290e83..7a67559 100644
--- a/tf-sync-github-repos.yaml
+++ b/tf-sync-github-repos.yaml
@@ -12,9 +12,9 @@
         echo "    Gerrit Environment"
         env |grep '^GERRIT'
         echo "########################################################################"
-        mkdir -p ci
-        wget -q https://git.trustedfirmware.org/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