…istry (#20528)

Why I did it
Changes to docker-ptf Dockerfile don't get automatically published to the docker registry accessed by the community. This PR addresses the issue.

Work item tracking
Microsoft ADO (number only): 29869315

How I did it
Modified the postSteps phase in azure-pipelines-image-template.yml to invoke the script to push docker-ptf image to the docker registry. The push is applicable to build branches (master, 202305, 202311 etc.) and not feature branches.

How to verify it
TBD

Tested branch (Please provide the tested image version)
Not applicable.

Description for the changelog
[docker-ptf]: CI change to publish docker-ptf image to the public/community docker registry

Change pipeline YAML to publish docker-ptf image to docker registry
Publish only docker-ptf image for main or release branches only and not feature branch

Link to config_db schema for YANG module changes
Not applicable

…into 202305