two 'docker-build' entries in Makefile

[usernameisnull]

What is the purpose of the change

two 'docker-build' entries in Makefile, one of them should be 'docker-image-release'

Brief changelog

XX

Verifying this change

XXXX

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[caigy]

It was imported in multi-platform build support, but it's not a grace way to just 'overwriting' the original docker-build target at that time.
As current version of operator-framework has supported multi-platform build, it would be grateful if you like to update the Makefile according to the current version of operator-framework.