Replace JENKINS_URL with JENKINS_PUBLIC_URL

To ensure tf-a-job-configs can run on both OpenCI
and Arm Test CI, JENKINS_URL has been replaced with
JENKINS_PUBLIC_URL, as JENKINS_URL is a reserved
private URL in Arm infrastructure.

JENKINS_PUBLIC_URL is a system-wide environment
variable and was configured in:
Manage Jenkins > System > Global Properties

Default values:
OpenCI Production Jenkins: https://ci.trustedfirmware.org/
OpenCI Staging Jenkins: https://ci.staging.trustedfirmware.org/
Arm Test CI Jenkins: https://jenkins.openci-test.arm.com/

Signed-off-by: Saheer Babu <saheer.babu@arm.com>
Change-Id: I546cf44d21ba7b7229b895d5c78b41019711895e
(cherry picked from commit e77abb3fb86a7e3f34c1ef582b9ea226e0da0ef6)
2 files changed