add long enough security.yml for test env

Change-Id: I4baf75daa50c2caec223f73c05d3fc9371c6a0af
Signed-off-by: Stephan Hagemann <stephan.hagemann@instructure.com>
Reviewed-on: https://gerrit.instructure.com/28634
Product-Review: Bryan Madsen <bryan@instructure.com>
Reviewed-by: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>