finish migrating range-web from jenkins to gh actions

Loads of jenkins pain as well as general direction from the lab has us needing to move away from jenkins for deployments/CI. Despite lack of relevant examples GH actions is the natural choice given capability and us already working on the platform. After previously getting no "hard no's" on #devops-howto, today I proved out (using a temp service account) using GH containers to run openshift CLI and talk to the cluster without logging any secrets. What's left is the usual pipeline mumbo jumbo:

- oc builds
- image stream tagging
- oc deploys
- cleanup
- pr/branch workflow considerations