v1.0.3 Release notes

What's Changed

• controller: set replicas if not set (backport #517) by @mergify[bot] in #528
• ci: use tag name instead of GIT_REF (backport #529) by @mergify[bot] in #530
• ci: prepare for 1.0.3 release by @Madhu-1 in #531

Full Changelog: v1.0.2...v1.0.3