Input for platforms in "publish image" workflow

[tom2drum]

Description and Related Issue(s)

Added input to "Publish image" workflow in order to build multiplatform image only for new release.

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added, changed, renamed, or removed an environment variable, I have updated the list of environment variables in the documentation and made the necessary changes to the validator script according to the guide