Remove GitHub publishing functionality

- Remove GitHub publishing tasks (generateGithubMeta, publishPluginToGithub, updateGithubIndex)
- Remove GitHub-related imports from NextflowPlugin.groovy
- Delete entire github/ directory with all GitHub publishing classes
- Update PluginPublishConfig to remove GitHub configuration
- Remove GitHub-related test cases from NextflowPluginTest
- Now only supports registry publishing via publishPluginToRegistry task

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: pditommaso

src/main/groovy/io/nextflow/gradle/NextflowPlugin.groovy

@@ -1,8 +1,5 @@
 package io.nextflow.gradle
 
-import io.nextflow.gradle.github.GithubUploadTask
-import io.nextflow.gradle.github.PluginMetadataTask
-import io.nextflow.gradle.github.UpdateJsonIndexTask
 import io.nextflow.gradle.registry.RegistryUploadTask
 import org.gradle.api.Plugin
 import org.gradle.api.Project
@@ -138,28 +135,6 @@ class NextflowPlugin implements Plugin<Project> {
                     publishTasks << project.tasks.publishPluginToRegistry
                 }
 
-                // add github publish task(s), if configured
-                if (config.publishing.github) {
-                    // generateGithubMeta - creates the meta.json file
-                    project.tasks.register('generateGithubMeta', PluginMetadataTask)
-                    project.tasks.generateGithubMeta.dependsOn << project.tasks.packagePlugin
-                    project.tasks.assemble.dependsOn << project.tasks.generateGithubMeta
-
-                    // publishPluginToGithub - publishes plugin assets to a github repo
-                    project.tasks.register('publishPluginToGithub', GithubUploadTask)
-                    project.tasks.publishPluginToGithub.dependsOn << [
-                        project.tasks.packagePlugin,
-                        project.tasks.generateGithubMeta
-                    ]
-                    publishTasks << project.tasks.publishPluginToGithub
-
-                    // updateGithubIndex - updates the central plugins.json index
-                    if (config.publishing.github.updateIndex) {
-                        project.tasks.register('updateGithubIndex', UpdateJsonIndexTask)
-                        project.tasks.updateGithubIndex.dependsOn << project.tasks.generateGithubMeta
-                        publishTasks << project.tasks.updateGithubIndex
-                    }
-                }
 
                 // finally, configure the destination-agnostic 'publish' task
                 if (!publishTasks.isEmpty()) {

src/main/groovy/io/nextflow/gradle/PluginPublishConfig.groovy

@@ -1,7 +1,6 @@
 package io.nextflow.gradle
 
 import groovy.transform.CompileStatic
-import io.nextflow.gradle.github.GithubPublishConfig
 import io.nextflow.gradle.registry.RegistryPublishConfig
 import org.gradle.api.Project
 
@@ -13,11 +12,6 @@ import org.gradle.api.Project
 class PluginPublishConfig {
     private final Project project
 
-    /**
-     * Configuration for publishing to github
-     */
-    GithubPublishConfig github
-
     /**
      * Configuration for publishing to a registry
      */
@@ -29,12 +23,6 @@ class PluginPublishConfig {
 
     def validate() {}
 
-    // initialises the 'github' sub-config
-    def github(Closure config) {
-        github = new GithubPublishConfig(project)
-        project.configure(github, config)
-    }
-
     def registry(Closure config) {
         registry = new RegistryPublishConfig(project)
         project.configure(registry, config)