Migrate from nexus-staging-maven-plugin to central-publishing-maven-plugin

[Copilot]

This PR migrates the CobiGen project from the legacy OSS1 Sonatype deployment system (nexus-staging-maven-plugin) to the new Central Sonatype deployment system (central-publishing-maven-plugin).

Changes Made

1. Updated Maven Plugin Configuration

• Replaced nexus-staging-maven-plugin (v1.6.8) with central-publishing-maven-plugin (v0.6.0)
• Configured new plugin with:
  • publishingServerId: central
  • autoPublish: false (manual publishing)
  • skipPublishing: ${skip.deployment} (respects existing deployment skip logic)

2. Removed Distribution Management

• Removed the entire <distributionManagement> section from the main POM
• The new plugin automatically derives repository URLs, eliminating the need for manual configuration

3. Updated Server Credentials

• Changed server ID from ossrh to central in .mvn/ci-settings.xml
• This aligns with the new Central Sonatype authentication requirements

4. Updated Repository URLs

• Updated snapshot repository URL from https://s01.oss.sonatype.org/content/repositories/snapshots/ to https://central.sonatype.com/repository/maven-snapshots
• Applied changes to:
  • Main POM repositories section
  • 14 template POM files in test resources
  • 4 test data settings.xml files

5. Updated Repository Names and IDs

• Changed repository IDs from ossrh to central
• Updated repository names from "OSSRH Snapshots" to "Central Repository Snapshots"

Files Modified

• pom.xml - Main configuration changes
• .mvn/ci-settings.xml - Server credential configuration
• 14 template POM files in cobigen-templates/*/src/test/resources/utils/pom.xml
• 4 test data files in cobigen/core-artifact-retriever/src/test/resources/testdata/
• 2 test template files in cobigen/cobigen-core/src/test/resources/testdata/

Validation

✅ XML structure validated as well-formed
✅ Maven validate phase passes successfully
✅ Central publishing plugin loads correctly
✅ Non-Eclipse modules build successfully with new configuration

The migration follows all requirements from the Central Sonatype documentation and maintains backward compatibility with existing deployment workflows.

Fixes #1700.

[!WARNING]

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• archive.eclipse.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.10/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.10/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.10 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.10/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/cobigen/cobigen org.codehaus.plexus.classworlds.launcher.Launcher clean compile -U (dns block)
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.10/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.10/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.10 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.10/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/cobigen/cobigen org.codehaus.plexus.classworlds.launcher.Launcher help:evaluate -Dexpression=project.modules (dns block)
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.10/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.10/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.10 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.10/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/cobigen/cobigen org.codehaus.plexus.classworlds.launcher.Launcher help:effective-pom -q -Doutput=/tmp/effective-pom.xml (dns block)
• repository.sonatype.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.10/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.10/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.10 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.10/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/cobigen/cobigen org.codehaus.plexus.classworlds.launcher.Launcher clean compile -U (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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