add KUBECTL_SHA256 to environment for passthru

We also need to add KUBECTL_SHA256 of the job environment for the
digest passthru to work.

Change-Id: I6c7a6afac76144f156e8dcd7364b80bb36d530e7
6 files changed
tree: a9a4a51b7f1ce3b1fde636bd852f97893d43b403
  1. jjb/
  2. .gitignore
  3. .gitreview
  4. .yamllint
  5. tox.ini