Update docker push to have latest

[elfarouk]

This is to avoid having the error when pulling with cmd (docker pull hpcaitech/colossalai)

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• [ x] I have created an issue for this PR for traceability
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🚨 Issue number

#3560

📝 What does this PR do?

Modify .github/workflows/release_docker_after_merge.yml to add "latest" tag creation

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[elfarouk]

Dear maintainer, can you have a look to this proposal.

This is a first draft, not sure 100% compatible with all the requirments

Thanks in advance

[FrankLeeeee]

Hi @elfarouk , I think this PR is good, just could you resolve the conflict? Appreciate it!

[FrankLeeeee]

Replaced by #3920 as this PR is not active. Thanks for @elfarouk for the contribution. Will close this issue now.