Generate an image per selected branch

[yersan]

Right now, our workflow publishes the latest wildfly operator build from the main branch on quay.io/wildfly/wildfly-operator:latest

However, we are now handling different branches, so we need to extend this feature and specify the name of the branches that will publish a new quay.io/wildfly/wildfly-operator tag

Tags will be created accordingly to the branch name: quay.io/wildfly/wildfly-operator:<branch-name>