enhance mergeCommandBuilder API with setMessage to avoid templating commit messages

scm-core/src/main/java/sonia/scm/repository/api/MergeCommandBuilder.java

@@ -181,6 +181,18 @@ public class MergeCommandBuilder {
     return this;
   }
 
+  /**
+   * Use this to set the commit message. If no message is set, the message template will be used.
+   *
+   * This is optional and for {@link #executeMerge()} only.
+   *
+   * @return This builder instance.
+   */
+  public MergeCommandBuilder setMessage(String message) {
+    request.setMessage(message);
+    return this;
+  }
+
   /**
    * Use this to reset the command.
    * @return This builder instance.

scm-core/src/main/java/sonia/scm/repository/spi/MergeCommandRequest.java

@@ -42,6 +42,7 @@ public class MergeCommandRequest implements Validateable, Resetable, Serializabl
   private String targetBranch;
   private Person author;
   private String messageTemplate;
+  private String message;
   private MergeStrategy mergeStrategy;
   private boolean sign = true;
 
@@ -77,6 +78,14 @@ public class MergeCommandRequest implements Validateable, Resetable, Serializabl
     this.messageTemplate = messageTemplate;
   }
 
+  public String getMessage() {
+    return message;
+  }
+
+  public void setMessage(String message) {
+    this.message = message;
+  }
+
   public MergeStrategy getMergeStrategy() {
     return mergeStrategy;
   }