This is a really naive way of creating a GKE cluster and condensing the GKE instructions from knative.dev
It uses bash, not terraform or Deployment Manager as this requires the least set and install for anyone. It isn't without issue, but I have found it very useful for spinning up a knative environment and then tearing it down again.
Perhaps in the future there maybe a more robust deployment. PRs welcome, some sections (around setting up Cloud DNS is commented) out.
You will need a GCP account will billing enabled and the gcloud SDK installed along with Kubectl (which gcloud installer can do for you). Hopefully if you are here, that is quite highly likely.
You will need to set up the Cloud DNS Zone first (currently set up is commented out). If you don't do this, cert-manager won't be able to do the DNS TXT record challenge.
Modify variables.sh with the required information (get your static IP first). Then to get a cluster with Knative and Cert Manager installed just run bash setup.sh and use bash teardown.sh to, well tear it all down.