
Prior change I6a45d35c242d40c4fabe6dd8aae3812327a8f743 incorrectly set the release pipeline so only PEP-440 prerelease tags would trigger it. Make the prerelease suffix optional so that normal release tags will also be enqueued. Change-Id: Iea86b08c5de8b15fd8d0d017106899226bbd0022