v6.3.0

This minor release includes the following changes:

• Support for a new package_test_rules matrix key (also usable in package_build_rules when no package_test_rules are specified) called test-image which can be used to test a built package in a different O/S than in which it was built, e.g. to test a Rocky Linux 9 package in Alma Linux 9 or CentOS Stream 9.