fix: migrate to nmcp 1.5.0 settings plugin for Maven Central publishing

The 0.0.8 project-level plugin's
publishAllProjectsProbablyBreakingProjectIsolation {} does not see
publications registered inside afterEvaluate blocks, so the aggregation
task was never created and the release workflow failed with:

  Task 'publishAllPublicationsToMavenCentral' not found

Switch to the 1.5.0 settings-plugin approach (com.gradleup.nmcp.settings),
which aggregates all subproject publications correctly regardless of when
they are wired.  The publish task becomes publishAggregationToCentralPortal.

Author: nficano

.github/workflows/release.yml

@@ -54,7 +54,7 @@ jobs:
           CENTRAL_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
           ORG_GRADLE_PROJECT_signingKey: ${{ secrets.GPG_SIGNING_KEY }}
           ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.GPG_SIGNING_PASSWORD }}
-        run: ./gradlew --no-daemon --stacktrace publishAllPublicationsToMavenCentral
+        run: ./gradlew --no-daemon --stacktrace publishAggregationToCentralPortal
 
       - name: Local publish (dry run)
         if: ${{ inputs.dry_run }}

build.gradle.kts

@@ -1,23 +1,7 @@
 plugins {
-    id("com.gradleup.nmcp") version "0.0.8"
     id("com.diffplug.spotless") version "6.25.0" apply false
 }
 
-// Publish all subproject maven-publish publications to Maven Central via the
-// Central Publisher Portal REST API (replaces the retired s01.oss.sonatype.org
-// OSSRH staging endpoint).  Credentials are read from CENTRAL_USERNAME /
-// CENTRAL_PASSWORD environment variables (or the corresponding Gradle
-// properties).  publicationType = "AUTOMATIC" auto-releases after upload.
-nmcp {
-    publishAllProjectsProbablyBreakingProjectIsolation {
-        username = (findProperty("centralUsername") as String?)?.ifBlank { null }
-                ?: System.getenv("CENTRAL_USERNAME")?.ifBlank { null } ?: ""
-        password = (findProperty("centralPassword") as String?)?.ifBlank { null }
-                ?: System.getenv("CENTRAL_PASSWORD")?.ifBlank { null } ?: ""
-        publicationType = "AUTOMATIC"
-    }
-}
-
 allprojects {
     group = "dev.arcp"
     version = "1.0.0-SNAPSHOT"
@@ -103,8 +87,6 @@ subprojects {
                         }
                     }
                 }
-                // No maven repository block here — nmcp handles Central Portal
-                // upload at the root project level.
             }
 
             // Signing is only wired when the developer has supplied a PGP key.

settings.gradle.kts

@@ -1,3 +1,15 @@
+plugins {
+    id("com.gradleup.nmcp.settings") version "1.5.0"
+}
+
+nmcpSettings {
+    centralPortal {
+        username = System.getenv("CENTRAL_USERNAME")?.ifBlank { null } ?: ""
+        password = System.getenv("CENTRAL_PASSWORD")?.ifBlank { null } ?: ""
+        publishingType = "AUTOMATIC"
+    }
+}
+
 rootProject.name = "arcp"
 
 include(