1953: added missed target_image parameter to build_docker_image method

[pahask8]

Fixes #1955

This change is 

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[pahask8]

@googlebot I fixed it.

[pahask8]

@googlebot I fixed it

[pahask8]

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@googlebot I fixed it.

[Ark-kun]

Fixes #1953
/lgtm
/approve

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[Ark-kun]

Hi @pahask8 . Your commit-e-mail seems to have a typo. Can you please try to fix it?

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[pahask8]

Hi @pahask8 . Your commit-e-mail seems to have a typo. Can you please try to fix it?

Hi @Ark-kun, done, please check.
Thank you

[Ark-kun]

/lgtm

[gaoning777]

This is not required since the containerBuilder will automatically use the target_image from the constructor function when it builds the image.

[pahask8]

@gaoning777 this is required if I use it like that:

import os
from kfp import compiler

build = compiler.build_docker_image(
    staging_gcs_path="gs://kfp-build-stage",
    target_image="gcr.io/staging/kfp-build",
    dockerfile_path="/Users/user/kubeflow_pipelines/docker_build/src/Dockerfile",
    timeout=600,
    namespace="kubeflow"
)