Gradle github release task with single asset upload example

gistfile1.groovy

import org.kohsuke.github.GitHub
import org.kohsuke.github.GHRepository
import org.kohsuke.github.GHOrganization
import org.kohsuke.github.GHReleaseBuilder
import org.kohsuke.github.GHRelease
 
class GithubReleaseTask extends DefaultTask {
 
   @Input
   public String authToken
 
   @Input
   public String organization
 
   @Input
   public String repository
 
   protected CharSequence input
 
   void setInputFile(CharSequence file) {
      this.input = file
   }
 
   void setInputFile(File file) {
      this.input = file.path
   }
 
   @InputFile
   File getInputFile() {
      return project.file(this.input)
   }
 
   @TaskAction
   def release() {
      Date date = new Date()
      GitHub github = GitHub.connectUsingOAuth(authToken)
      GHOrganization organization = github.getOrganization(organization)
      GHRepository repository = organization.getRepository(repository)
      GHReleaseBuilder releaseBuilder = backend.createRelease("v${->project.version}")
      releaseBuilder.body("Release automatically created on $date")
      releaseBuilder.draft(false)
      releaseBuilder.name("v${->project.version}")
      GHRelease release = releaseBuilder.create()
      release.uploadAsset(this.getInputFile(), "application/octet-stream")
   }
}