Support using env variables to populate trigger params
Make it easier to trigger a package-and-qa pipeline using custom component versions. Discussion that resulted in this happened in https://gitlab.slack.com/archives/C3ER3TQBT/p1574654082022300
Make it easier to trigger a package-and-qa pipeline using custom component versions. Discussion that resulted in this happened in https://gitlab.slack.com/archives/C3ER3TQBT/p1574654082022300