Switch to sbt-ci-release 1.11.2 for Central Portal publishing

- Upgrade sbt 1.9.8 → 1.11.0 (required for Central Portal support)
- Replace sbt-sonatype + sbt-pgp with sbt-ci-release 1.11.2
- Remove version.sbt (sbt-dynver derives version from git tags)
- Simplify publish workflow to use ci-release command
- Central Portal is now the default (no legacy OSSRH needed)
- Add Maven Central badges and installation section to README

Author: derrickburns

.github/workflows/publish.yml

@@ -1,23 +1,19 @@
 name: Publish to Maven Central
 
 on:
-  release:
-    types: [published]
-  workflow_dispatch:
-    inputs:
-      version:
-        description: 'Version to publish (e.g., 0.7.0)'
-        required: true
-        type: string
+  push:
+    tags:
+      - "v*"
 
 jobs:
   publish:
     runs-on: ubuntu-latest
     name: Publish to Maven Central
-
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # sbt-dynver needs full git history
 
       - name: Set up JDK 17
         uses: actions/setup-java@v4
@@ -28,39 +24,18 @@ jobs:
       - name: Set up sbt
         uses: sbt/setup-sbt@v1
 
-      - name: Import GPG key
-        uses: crazy-max/ghaction-import-gpg@v6
-        with:
-          gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
-          passphrase: ${{ secrets.GPG_PASSPHRASE }}
-
-      - name: Publish Scala 2.13 artifacts
+      - name: Publish Scala 2.13
+        run: sbt ++2.13.14 ci-release
         env:
-          SONATYPE_USERNAME: ${{ secrets.SONATYPE_USERNAME }}
-          SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
           PGP_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
-        run: |
-          sbt ++2.13.14 \
-            'set credentials += Credentials("Sonatype Nexus Repository Manager", "central.sonatype.com", sys.env("SONATYPE_USERNAME"), sys.env("SONATYPE_PASSWORD"))' \
-            'set pgpPassphrase := sys.env.get("PGP_PASSPHRASE").map(_.toCharArray)' \
-            clean compile publishSigned
-
-      - name: Publish Scala 2.12 artifacts
-        env:
+          PGP_SECRET: ${{ secrets.GPG_PRIVATE_KEY }}
           SONATYPE_USERNAME: ${{ secrets.SONATYPE_USERNAME }}
           SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
-          PGP_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
-        run: |
-          sbt ++2.12.18 \
-            'set credentials += Credentials("Sonatype Nexus Repository Manager", "central.sonatype.com", sys.env("SONATYPE_USERNAME"), sys.env("SONATYPE_PASSWORD"))' \
-            'set pgpPassphrase := sys.env.get("PGP_PASSPHRASE").map(_.toCharArray)' \
-            clean compile publishSigned
 
-      - name: Release to Maven Central
+      - name: Publish Scala 2.12
+        run: sbt ++2.12.18 ci-release
         env:
+          PGP_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
+          PGP_SECRET: ${{ secrets.GPG_PRIVATE_KEY }}
           SONATYPE_USERNAME: ${{ secrets.SONATYPE_USERNAME }}
           SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
-        run: |
-          sbt \
-            'set credentials += Credentials("Sonatype Nexus Repository Manager", "central.sonatype.com", sys.env("SONATYPE_USERNAME"), sys.env("SONATYPE_PASSWORD"))' \
-            sonatypeBundleRelease

build.sbt

@@ -67,10 +67,7 @@ javacOptions ++= (if (javaMajor <= 8) Seq("-source", "1.8", "-target", "1.8") el
     Test / publishArtifact := false
     pomIncludeRepository := { _ => false }
 
-    // Sonatype Central Portal settings
-    sonatypeProfileName := "com.massivedatascience"
-    publishTo := sonatypePublishToBundle.value
-    sonatypeCredentialHost := "central.sonatype.com"
+    // sbt-ci-release 1.11+ publishes to Central Portal by default
 
     // POM metadata required by Maven Central
     homepage := Some(url("https://github.com/derrickburns/generalized-kmeans-clustering"))

project/build.properties

@@ -1 +1 @@
-sbt.version=1.9.8
+sbt.version=1.11.0

project/plugins.sbt

@@ -39,9 +39,8 @@ addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.2.2")
 // Resolve scala-xml version conflict between scoverage and scalariform
 ThisBuild / libraryDependencySchemes += "org.scala-lang.modules" %% "scala-xml" % VersionScheme.Always
 
-// Publishing plugins
-addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.9.21")
-addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.2.1")
+// Publishing to Maven Central via Central Portal (requires sbt 1.11+)
+addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.11.2")
 
 // Documentation
 addSbtPlugin("com.github.sbt" % "sbt-unidoc" % "0.5.0")