create a pin script for outputting how to pin the current release

/assign @joshwolf

❯ ./hack/pin.sh                                                                

istio:
  git:
    commit: f40172dd278e4f3551e6a1e8d4c8625771fbf928
    branch: chart-release
clusterAuditor:
  git:
    commit: 4ca478df04063ec8cd91b3ae2d2472b77675495d
    branch: chart-release
gatekeeper:
  git:
    commit: 714069053e9696f5e116deb2f677f1c2d213e9b6
    branch: chart-release
logging:
  git:
    commit: 02d6e9a073d196ecdf0951941c432beea642fc73
    branch: release-v0.2.x
monitoring:
  git:
    commit: 014fb187b81eb976e76a4bb1a76bb4479aa2cea3
    branch: release-v0.2.x
twistlock:
  git:
    commit: faf038197291915713e0f213a4e35991e72f73f6
    branch: chart-release

Can be used on a cluster to easily pull out the right values to be used.