SLING-11933 - Allow configuring the repository URLs (#13)

diff --git a/src/main/java/org/apache/sling/maven/feature/launcher/Launch.java b/src/main/java/org/apache/sling/maven/feature/launcher/Launch.java
index a0c3d10..bf4aaca 100644
--- a/src/main/java/org/apache/sling/maven/feature/launcher/Launch.java
+++ b/src/main/java/org/apache/sling/maven/feature/launcher/Launch.java
@@ -18,8 +18,10 @@
  */
 package org.apache.sling.maven.feature.launcher;
 
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.regex.Pattern;
 
@@ -35,6 +37,7 @@
     private int startTimeoutSeconds = 30;
     private boolean skip = false;
     private Map<String,String> environmentVariables = new HashMap<>();
+    private List<String> repositoryUrls = new ArrayList<>();
 
     public String getId() {
         return id;
@@ -86,6 +89,14 @@
         this.environmentVariables = environmentVariables;
     }
 
+    public List<String> getRepositoryUrls() {
+        return repositoryUrls;
+    }
+
+    public void setRepositoryUrls(List<String> repositoryUrls) {
+        this.repositoryUrls = repositoryUrls;
+    }
+
     public void validate() {
         if ( id == null || id.trim().isEmpty() ) 
             throw new IllegalArgumentException("Missing id");
diff --git a/src/main/java/org/apache/sling/maven/feature/launcher/StartMojo.java b/src/main/java/org/apache/sling/maven/feature/launcher/StartMojo.java
index 2278d6f..6350c9e 100644
--- a/src/main/java/org/apache/sling/maven/feature/launcher/StartMojo.java
+++ b/src/main/java/org/apache/sling/maven/feature/launcher/StartMojo.java
@@ -30,6 +30,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.StringJoiner;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
@@ -121,6 +122,7 @@
     @Component
     private ArchiverManager archiverManager;
 
+    @Override
     public void execute() throws MojoExecutionException, MojoFailureException {
 
         try {
@@ -229,6 +231,12 @@
                     args.add("-jar");
                     args.add(launcher.getAbsolutePath());
                 }
+                if ( launch.getRepositoryUrls() != null && !launch.getRepositoryUrls().isEmpty() ) {
+                    args.add("-u");
+                    StringJoiner joiner = new StringJoiner(",");
+                    launch.getRepositoryUrls().forEach( joiner::add );
+                    args.add(joiner.toString());
+                }
                 args.add("-f");
                 args.add(featureFile.getAbsolutePath());
                 args.add("-p");