The step ran only when release-please reported a pull request as created, which is once. It rewrites
that branch on every later push to main, and a release pull request that could not be merged the
first time is never retried -- main advancing during the build is the normal way that happens, and
the script deliberately leaves the pull request open in that case, so the two together meant it
would sit there forever.
Finding the branch through git/matching-refs and then its open pull request covers both: a rewritten
head gets a fresh build, and a pull request left open gets picked up on the next push. Taken from
MSIME-Linux#38, which caught the same mistake in the equivalent change there.
Evan Hu
550e0a1c70