ci: fix issues with the container image by adding some sanity checks before pushing

[HarikrishnanBalagopal]

Description of the change

[haribala@aiplatformwh ~]$ docker run --rm -it --entrypoint which quay.io/foundation-model-stack/fms-hf-tuning:main-nvcr-latest ls
/usr/bin/ls
[haribala@aiplatformwh ~]$ echo $?
0
[haribala@aiplatformwh ~]$ docker run --rm -it --entrypoint which quay.io/foundation-model-stack/fms-hf-tuning:main-nvcr-latest accelerate
[haribala@aiplatformwh ~]$ echo $?
1

Related issue number

How to verify the PR

Was the PR tested

• I have added >=1 unit test(s) for every new method I have added.
• I have ensured all unit tests pass

[github-actions]

Thanks for making a pull request! 😃
One of the maintainers will review and advise on the next steps.

[dushyantbehl]

/build

[dushyantbehl]

LGTM

[github-actions]

Build succeeded for 5da0a62 (NVCR image)

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