jx pipeline start can't start pull request pipeline

[msvticket]

You can't start a pipeline for a pull request with jx pipeline start. If you try by for example give the branch with --branch the following necessary environment variables will not be set in in the build pod:

• PULL_NUMBER
• PULL_PULL_REF
• PULL_PULL_SHA

So you could for example get this error:

+ jx gitops pr variables
error: failed to : missing option: --pr

[msvticket]

Maybe you could technically give those environment variables with --env, but that wouldn't be very practical.