CircleCI renders the boolean push parameter as 1/0 in the step
environment, but build_push_supplemental.sh only pushed when
PUSH_IMAGES was the string "true". Since 0.3.5 every release build
built and scanned supplemental images and never pushed them, so
deployments referencing them hit ImagePullBackOff (kof22 0.1.75).
PUSH_IMAGES now accepts true/1/yes/on and false/0/no/off/empty; unset
still means push, and an unrecognised value fails before any build.
Tests cover release-mode pushes (1, true, TRUE) of every supplemental
image, PR-mode non-pushes (0, false, empty), and the invalid value.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: James Maes <james@kof22.com>