amcheck packages in pgdg yum repo

I would like to make amcheck available in the pgdg yum repo, in order
to target earlier PostgreSQL versions. It's available as a contrib
extension for v10 already, but there is no reason why it cannot be
used on earlier versions. The Github version has the ability to build
deb packages already, and is now on the pgdg apt repo:

https://github.com/petergeoghegan/amcheck

I'll need to figure out how to also build yum packages. It's the
simplest possible case of building a PGXS C extension with no
dependencies. Can someone point me in the direction of documentation,
or another module whose package build process I can generalize from?

I'll also want to make available the enhancement that is proposed for
Postgres 11, from the current commitfest [1] [2]. So, the goal will be to
target Postgres 9.4, 9.5, 9.6, and 10 - v10 will not have an enhanced
version, which I believe adds significantly more value.

Is there an acceptance process? How can I get the ball rolling on that?

Thanks

[1] https://commitfest.postgresql.org/14/1263/
[2] https://github.com/petergeoghegan/amcheck/tree/heap-check
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Peter Geoghegan