Always recreate manager_image_patch.yaml (#575)
Always recreate manager_image_patch.yaml (#575)

This avoids issues like infinitely appending fields
to manager_image_patch.yaml and people's build files
failing due to an outdated patch.

Signed-off-by: Max Smythe <020ed0f62d962fe89bc3ebace9f24eab664596f1@google.com>
open-policy-agent/gatekeeper,open-policy-agent/gatekeeper,open-policy-agent/gatekeeper,open-policy-agent/gatekeeper,open-policy-agent/gatekeeper