build: Modernize, use sbt-ci-release for releases

[johanandren]

Drops all the ancient formatting/findbugs/test coverage stuff and bumps sbt to latest. Adds an initial publish/release CI job that may need further iterations (or we are lucky and just need to add credentials to the repo)

[mkurz]

I am pretty sure you need to remove these lines as well

config/build.sbt

Lines 28 to 32 in 41c5b72

	ThisBuild / publishTo := {
	val nexus = "https://oss.sonatype.org/"
	if ((ThisBuild / isSnapshot).value) Option("Sonatype OSS Snapshots" at nexus + "content/repositories/snapshots")
	else Option("Sonatype OSS Staging" at nexus + "service/local/staging/deploy/maven2")
	}

[mkurz]

Not sure if this is needed as well:

config/build.sbt

Line 33 in 41c5b72

ThisBuild / publishMavenStyle := true

If publishing isn't working I would try removing this line first.

[sebastian-alfers]

LGTM