As a developer I want to automate Gateway API feature testing on Prow so that it pulls pre-release OSSM builds or catalog sources.

Notes: 

Pre-release builds can be found with this query: https://brewweb.engineering.redhat.com/brew/search?terms=istio-rhel8-operator-metadata-container*&type=build&match=regexp

For example, https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=2490113

https://gitlab.cee.redhat.com/istio/servicemesh-qe/jenkins-csb-declaration/-/blob/master/jenkinsfiles/install-jobs/install-service-mesh.jenkinsfile contains the OSSM Jenkinsfile for their installation automation.  Seems to use repo brew.registry.redhat.io/rh-osbs/iib-pub-pending:v${ocp_version_short}

https://docs.ci.openshift.org/docs/how-tos/testing-operator-sdk-operators/#simple-operator-installation may offer some way to test the maistra operator.