Add a release follow-up job that updates the Homebrew tap from the checksum manifest when a tap token is configured.
The job now skips before checkout/download/update when neither HOMEBREW_TAP_PAT nor RELEASE_TAG_PAT is configured, so missing tap credentials do not fail an otherwise successful release.
Closes#1602.
Co-authored-by: Zhiping <2716057626@qq.com>
Co-authored-by: Oliver-ZPLiu <47081637+Oliver-ZPLiu@users.noreply.github.com>
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