Add additional labels to function deployments

[lance]

Currently, when we deploy a function as a knative Service, we add two labels boson.dev/function=true and boson.dev/runtime=[runtime]. It might be also useful to add the builder used to create the image. Since the image name and digest are already captured in the Service definition, I don't think that's necessary to add as a label. But would it make sense to allow for a labels section in func.yaml which would allow developers to easily apply labels to their functions. E.g.

labels:
  type: telegram.message
  botId: language.filter

What do you all think?

[lkingland]

Seems like a good idea to me, if there is the need for it now. Labels is also a very generic concept so our abstraction remains intact (just like our discussion around Secrets).

[zroubalik]

Agree, good idea.

[embano1]

+1 since we're using function labels to show/filter them in UI in the VEBA project

[lance]

It might be also useful to add the builder used to create the image

I tried this, but labels have restrictions on the characters that can be used, and a slash as in quay.io/boson-project/some-builder is not acceptable.