[ARCHETYPE-638] - fix: maven-archetype pom.xml should add request encoding

This commit remove below warning:
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!

Author: qxo

archetype-common/src/main/java/org/apache/maven/archetype/creator/FilesetArchetypeCreator.java

@@ -138,7 +138,8 @@ public void createArchetype( ArchetypeCreationRequest request, ArchetypeCreation
         try
         {
             File archetypePomFile = createArchetypeProjectPom( project, request.getProjectBuildingRequest(),
-                                                               configurationProperties, outputDirectory );
+                                                               configurationProperties, outputDirectory,
+                                                               defaultEncoding );
 
             File archetypeResourcesDirectory = new File( outputDirectory, getTemplateOutputDirectory() );
 
@@ -391,10 +392,12 @@ else if ( !properties.containsKey( Constants.PACKAGE ) )
      * Create the archetype project pom.xml file, that will be used to build the archetype.
      */
     private File createArchetypeProjectPom( MavenProject project, ProjectBuildingRequest buildingRequest,
-                                            Properties configurationProperties, File projectDir )
+                                            Properties configurationProperties, File projectDir,
+                                            String defaultEncoding )
         throws TemplateCreationException, IOException
     {
         Model model = new Model();
+        model.getProperties().put( "project.build.sourceEncoding", defaultEncoding );
         model.setModelVersion( "4.0.0" );
         // these values should be retrieved from the request with sensible defaults
         model.setGroupId( configurationProperties.getProperty( Constants.ARCHETYPE_GROUP_ID, project.getGroupId() ) );