Automated releases for tektoncd projects

tektoncd/operator and tektoncd/cli as examples. We have 2 choices:

• Use GitHub workflows for everything (easier, but…)
  • tektoncd/cli is a good candidate here : build, test, build image and goreleaser are all super easy to do.
• Use GitHub workflows to send a payload to dogfooding (harder, but…)
  • tektoncd/operator could be interesting to try out with here.