Add support for optional attach parameter to disable artifact attachment

Author: peter277

src/main/java/org/apache/maven/plugins/jlink/JLinkMojo.java

@@ -334,6 +334,12 @@ public class JLinkMojo extends AbstractJLinkMojo {
     @Parameter
     private File sourceJdkModules;
 
+    /**
+     * Controls whether the plugin tries to attach the resulting artifact to the project.
+     */
+    @Parameter(defaultValue = "true")
+    private boolean attach;
+
     /**
      * Classifier to add to the artifact generated. If given, the artifact will be attached
      * as a supplemental artifact.
@@ -453,14 +459,16 @@ public void execute() throws MojoExecutionException, MojoFailureException {
 
         File createZipArchiveFromImage = createZipArchiveFromImage(buildDirectory, outputDirectoryImage);
 
-        if (hasClassifier()) {
-            projectHelper.attachArtifact(getProject(), "jlink", getClassifier(), createZipArchiveFromImage);
-        } else {
-            if (projectHasAlreadySetAnArtifact()) {
-                throw new MojoExecutionException("You have to use a classifier "
-                        + "to attach supplemental artifacts to the project instead of replacing them.");
+        if (attach) {
+            if (hasClassifier()) {
+                projectHelper.attachArtifact(getProject(), "jlink", getClassifier(), createZipArchiveFromImage);
+            } else {
+                if (projectHasAlreadySetAnArtifact()) {
+                    throw new MojoExecutionException("You have to use a classifier "
+                            + "to attach supplemental artifacts to the project instead of replacing them.");
+                }
+                getProject().getArtifact().setFile(createZipArchiveFromImage);
             }
-            getProject().getArtifact().setFile(createZipArchiveFromImage);
         }
     }