feat: modular workflow rules

mentioned in commit ddadf795

mentioned in merge request to-be-continuous/samples/golang-cnb-helm-on-kubernetes!80

mentioned in merge request to-be-continuous/samples/golang-cnb-on-kubernetes!78

mentioned in merge request to-be-continuous/samples/golang-cnb-on-kubernetes!80

mentioned in merge request to-be-continuous/samples/angular-on-s3!238

mentioned in merge request to-be-continuous/samples/angular-on-s3!241 (merged)

mentioned in merge request to-be-continuous/samples/golang-cnb-helm-on-kubernetes!82

mentioned in merge request to-be-continuous/samples/golang-docker-on-aws!134 (merged)

mentioned in merge request to-be-continuous/samples/golang-on-cloudfoundry!88 (closed)

mentioned in merge request to-be-continuous/samples/golang-on-cloudfoundry!91 (merged)