Reduce GitHub API usage by trusting nobody

Checking for collaborator permissions requires GitHub API calls, and we
never change the Jenkinsfile in the repos, so fetch the upstream
Jenkinsfile unconditionally.

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Change-Id: Idfee2992c899925fda0b85b191dd501ef62031c7
4 files changed