Ignore automatic copying of images to dockerhub for hotfix tags

[vusirikala]

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Description

When creating a hotfix releases from private branch, when creating the release page, then automatically the hotfix tag is being created for the public repo as well and the docker image corresponding to the tag are being published both for public and private PRs. This PR is to avoid automatic pushing of docker images for hotfix tags.

How Has This Been Tested?

Key Areas to Review

Type of Change

• [ ] New feature
• [ ] Bug fix
• [ ] Breaking change
• [ ] Performance improvement
• [ ] Refactoring
• [ ] Dependency update
• [ ] Documentation update
• [ ] Tests

Which Components or Systems Does This Change Impact?

• [ ] Validator Node
• [ ] Full Node (API, Indexer, etc.)
• [ ] Move/Aptos Virtual Machine
• [ ] Aptos Framework
• [ ] Aptos CLI/SDK
• [ ] Developer Infrastructure
• [ ] Move Compiler
• [ ] Other (specify)

Checklist

• [ ] I have read and followed the CONTRIBUTING doc
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I identified and added all stakeholders and component owners affected by this change as reviewers
• [ ] I tested both happy and unhappy path of the functionality
• [ ] I have made corresponding changes to the documentation