CouchDB does not rush to release binaries for Debian/Ubuntu/CentOS/RHEL
on major x.0 releases.
It is unlikely we will publish any buster package until after its
official promotion to stable. No release date has been set yet for
buster, though we're aware it is in freeze status. After release, we
will then add buster to our CI matrix and ensure regression tests pass
properly before releasing. If history serves, you can expect the package
roughly a month after the buster release.
If you need it running on buster sooner, you are always welcome to
compile from scratch. Bug reports and pull requests against our CI or
packaging repos from issues you find are always welcome.