Image builder fails when using a build config with an inline dockerfile containing a heredoc: "EOF: unterminated heredoc"

[lucastheisen]

I cannot find anything stating that this use case is not supported, and have found comments stating heredoc's have been supported by buildah for a couple years. So it seems like this should work:

---
apiVersion: image.openshift.io/v1
kind: ImageStream
metadata:
  labels:
    ad-hoc: build-inline-dockerfile-heredoc
  name: foo
---
apiVersion: build.openshift.io/v1
kind: BuildConfig
metadata:
  labels:
    ad-hoc: build-inline-dockerfile-heredoc
  name: foo
spec:
  output:
    to:
      kind: ImageStreamTag
      name: foo:latest
  resources:
    requests:
      cpu: .5
      memory: 10Mi
    limits:
      cpu: 1
      memory: 100Mi
  source:
    dockerfile: |
      FROM registry.access.redhat.com/ubi9/ubi:latest
      COPY <<EOF  /entrypoint.sh
      printf "hello world!" \
      EOF\
      ENTRYPOINT ["/entrypoint.sh"]
  strategy:
    type: Docker

But it results in this error:

ltheisen@PC ~/tmp/VSRPPROTO-893
$ oc --context epic --namespace pd-kube-ci apply --filename foo.yml
imagestream.image.openshift.io/foo unchanged
buildconfig.build.openshift.io/foo configured

ltheisen@PC ~/tmp/VSRPPROTO-893
$ oc --context epic --namespace pd-kube-ci start-build foo --follow
build.build.openshift.io/foo-2 started
Adding cluster TLS certificate authority to trust store
error: EOF: unterminated heredoc

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