Build workflow modification

[Kaniska244]

Description of changes:

• Changing the trigger of dev container images build workflow trigger such that it will be triggered when a new release is published in images repository when the target branch is the main branch.

Changelog:

• Change in /.github/workflows/push.yml to change the trigger.

Checklist:

• All checks are passed.

[Copilot]

Pull request overview

This PR modifies the build workflow to trigger on release publication instead of tag pushes. The workflow will now only execute when a release is published targeting the main branch, replacing the previous tag-based trigger mechanism.

Key Changes:

• Changed workflow trigger from push with tag filter to release with published event
• Updated the conditional check from base_ref to release.target_commitish for verifying the main branch