Alan Agius ca0fcd6c08 ci: only run publish_snapshot when not PR (#41877)
Currently, the non forked PRs such as Renovate will run `publish_snapshot` because `CIRCLE_PR_NUMBER` is not defined for PRs which are opened from non forked repos. Instead we add a filter to only run `publish_snapshot` on releasable branches.

Example of run were the mentioned variable is not defined https://app.circleci.com/pipelines/github/angular/angular/32093/workflows/7c8c4cfc-e6f6-44fc-a6dc-a82a6ac862db/jobs/976611

PR Close #41877
2021-04-29 10:16:03 -07:00
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