Document developing the pipeline locally

[a-roberts]

Expected Behavior

It should be real simple to hack around with build-pipeline on one's laptop

Actual Behavior

A few gotchas as the steps assume we want to use gcr.io

Steps to Reproduce the Problem

1. Follow build-pipeline's developing docs
2. Realise the need to fiddle with a few properties
3. Perhaps trip up with using ko so really stress the need for a proper Gopath

Additional Info

#425 please 👼

[bobcatfish]

Looks like we'll get some of this with #430 but this issue I think is more focused on the developer experience, while #430 is about following along with the tutorial specifically (correct me if I'm wrong @a-roberts !)

[a-roberts]

Yep @bobcatfish, exactly 😄

[dibyom]

Done in #495 I think
/close

[tekton-robot]

@dibyom: Closing this issue.

In response to this:

Done in #495 I think
/close

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