v0.15.1

What's Changed

• fix: #896 App of apps being overwritten by image-updater [release-0.15] by @chengfang in #920
• Release 0.15.1 by @chengfang in #921
• fix(build): add step to Makefile to generate signing gpg key by @chengfang in #922
• chore: fix the .phony target name for multiarch-image-push by @chengfang in #923
• Revert "Release 0.15.1 (#921)" by @chengfang in #924
• Release 0.15.1 by @chengfang in #925

Full Changelog: v0.15.0...v0.15.1