custom kodataRoot and kodata per image

[xmlking]

proposing to support customizing kodataRoot per image level. currently it is hardcoded at /var/run/ko

const kodataRoot = "/var/run/ko"

also would be nice to allow developers to keep kodata in any prefered directory relative to source root.
this allow to keep per module kodata folder in monorepo projects that represent multiple sub modules

[jonjohnsonjr]

Somewhat related #55

[mschwrz]

Can you make a suggestion on how to supply the custom kodataRoot?

[xmlking]

here is the proposal for copying multiple source directories to image

baseImageOverrides:
  github.com/my-org/my-repo/path/to/binary: docker.io/another/base:latest
buildOverrides:
  github.com/my-org/my-repo/path/to/binary:
    env:
    - name: CGO_ENABLED
      value: 1
    flags:
    - name: ldflags
      value: "-X main.Version=foo"
    data:
    - source: "config/template"
      destination: "template"
    - source: "config/seed"
      destination: "data/seed"

destination is relative to WorkingDir
source is relative to PrtojectRoot

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