E2E: Use Helm instead of Docker

[richard-cox]

Summary

• Swap out docker for k3s for rancher host when running e2e tests

Occurred changes and/or fixed issues

• Currently e2e tests run the all-in-one docker image of -head
• Change this to instead to install rancher with helm to k3s
• This might resolve the following
  • General rancher performance is impacted by the overhead of running docker and within it the k3s that runs rancher
  • Using helm instead of docker might resolve the rancher-webhook service errors

Technical notes summary

• we use the sslip.io magic domain
• this does add on about 50 seconds per e2e matrix run (it takes longer to install pre-reqs plus actual install then just docker run

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[richard-cox]

should be passed in?