releasePublishArtifactsAction doesnt seem to catch - scala

Question

I am trying to publish a multi project to sonatype using sbt-release, sbt-pgp and sbt-sonatype plugins.
while running: sbt publishLocalSigned I see the .asc file published.
but when running sbt release to sonatype I can only see the .md5 and sha1 files.
here is my release.sbt:
import ReleaseTransformations._
// publishing
publishMavenStyle in ThisBuild := true
credentials in ThisBuild += Credentials(Path.userHome / ".ivy2" / ".credentials_sonatype")
publishTo in ThisBuild := {
val nexus = "https://oss.sonatype.org/"
if (version.value.trim.endsWith("SNAPSHOT"))
Some("snapshots" at nexus + "content/repositories/snapshots")
else
Some("releases" at nexus + "service/local/staging/deploy/maven2")
}
publishArtifact in Test := false
pomIncludeRepository in ThisBuild := { _ => false }
pomExtra in ThisBuild := {
<url>my.url</url>
<licenses>
<license>
<name>The Apache Software License, Version 2.0</name>
<url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
<scm>
<connection>scm:git:git#github.com:url.git</connection>
<developerConnection>scm:git:git#github.com:url.git</developerConnection>
<url>url</url>
</scm>
<developers>
<developer>
<id>dev</id>
<name>dev</name>
<email>dev#gmail.com</email>
</developer>
</developers>
}
// use maven style tag name
releaseTagName in ThisBuild := s"${name.value}-${(version in ThisBuild).value}"
// sign artifacts
releasePublishArtifactsAction in ThisBuild := PgpKeys.publishSigned.value
// don't push changes (so they can be verified first)
releaseProcess in ThisBuild := Seq(
checkSnapshotDependencies,
inquireVersions,
runTest,
setReleaseVersion,
commitReleaseVersion,
tagRelease,
publishArtifacts,
setNextVersion,
commitNextVersion,
pushChanges,
releaseStepCommand("sonatypeRelease")
)
my plugin.sbt:
addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.5.1")
addSbtPlugin("org.scoverage" % "sbt-coveralls" % "1.2.7")
addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "2.3")
addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.1.0")
addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.11")
I am sure my gpg keys are properly set, otherwise I wont be able to run the publishLocalSigned but it seems like I miss something to my sbt-gpg plugin to kick in on release.
sbt version is 1.2.8 and I tried to downgrade to 0.13.17 and got the same behaviour.
I have to mention I was mainly following the jackson-module-scala approach:
https://github.com/FasterXML/jackson-module-scala/blob/master/release.sbt