FIXME: re-worked PushImage function to exec the docker cli, or convert other docker helpers to using the client library.

[satyazzz123]

Summary

Reworked PushImage function to exec the docker cli, or convert other docker helpers to using the client library.

Release notes

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Related

Resolves #914

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Context

This PR addresses the FIXME comment by directly executing the Docker CLI to push the image

[satyazzz123]

@natalieparellano I have raised a PR for docker.go FIXME . Please have a look. Thank you