Fix Maven Central publishing: add missing sbt-sonatype plugin (#23)

* Initial plan

* Add sbt-sonatype plugin and configure for Maven Central publishing

Co-authored-by: alexandru <11753+alexandru@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: alexandru <11753+alexandru@users.noreply.github.com>

Author: Copilot

build.sbt

@@ -2,6 +2,7 @@ import java.io.FileInputStream
 import java.util.Properties
 import sbt.ThisBuild
 import scala.sys.process.Process
+import xerial.sbt.Sonatype.sonatypeCentralHost
 
 val scala3Version = "3.3.7"
 val scala2Version = "2.13.18"
@@ -16,6 +17,8 @@ inThisBuild(
   Seq(
     organization := "org.funfix",
     scalaVersion := scala2Version,
+    // Configure for Sonatype Central Portal
+    sonatypeCredentialHost := sonatypeCentralHost,
     // ---
     // Settings for dealing with the local Gradle-assembled artifacts
     // Also see: publishLocalGradleDependencies
@@ -102,7 +105,7 @@ val sharedSettings = Seq(
   publishTo := {
     val centralSnapshots = "https://central.sonatype.com/repository/maven-snapshots/"
     if (version.value.endsWith("-SNAPSHOT")) Some("central-snapshots".at(centralSnapshots))
-    else localStaging.value
+    else sonatypePublishToBundle.value
   },
 
   // ScalaDoc settings
@@ -179,5 +182,5 @@ addCommandAlias(
 )
 addCommandAlias(
   "ci-publish",
-  ";publishLocalGradleDependencies; +Test/compile; +publishSigned; sonaUpload"
+  ";publishLocalGradleDependencies; +Test/compile; +publishSigned; sonatypeBundleRelease"
 )

project/plugins.sbt

@@ -2,6 +2,7 @@ addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.6")
 addSbtPlugin("org.typelevel" % "sbt-tpolecat" % "0.5.2")
 addSbtPlugin("org.wartremover" % "sbt-wartremover" % "3.5.5")
 addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.3.1")
+addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.12.2")
 
 // https://github.com/typelevel/sbt-tpolecat/issues/291
 libraryDependencies += "org.typelevel" %% "scalac-options" % "0.1.9"