Auto-create Big Bang MR when an individual package's chart version is updated

Issue

• Closes https://repo1.dso.mil/platform-one/big-bang/pipeline-templates/pipeline-templates/-/issues/40

Examples

• auto tag job that created the BB MR

  • https://repo1.dso.mil/platform-one/big-bang/pipeline-templates/package-validation/-/jobs/11796064

• Big Bang merge request that was created

  • https://repo1.dso.mil/platform-one/big-bang/bigbang/-/merge_requests/1623

Summary

• The goal is to automate the creation of a Big Bang MR when a package cuts a new release tag

• The Big Bang MR change consists of the git tag being bumped in chart/values.yaml

• The Big Bang MR does not link to the related issue. Since every package MR may or may not have the related issue linked, collecting and associating the correct issue with the Big Bang MR has been a challenge. I'm open to suggestions if there are any.