Restore publish settings to before sbt-ci-release (#1999) (#2002)

sbt-ci-release changes the commands required to publish to Sonatype.
While this may be a desirable change at some point, it is inconsistent
with other repos. Reverting for the time being.

(cherry picked from commit 594f783b

)

Co-authored-by: Jack Koenig <koenig@sifive.com>