[MNG-7184] document .mavenrc/mavenrc_pre.bat|cmd and MAVEN_SKIP_RC

apache-maven/src/site/apt/index.apt.vm

@@ -0,0 +1,40 @@
+~~ Licensed to the Apache Software Foundation (ASF) under one
+~~ or more contributor license agreements.  See the NOTICE file
+~~ distributed with this work for additional information
+~~ regarding copyright ownership.  The ASF licenses this file
+~~ to you under the Apache License, Version 2.0 (the
+~~ "License"); you may not use this file except in compliance
+~~ with the License.  You may obtain a copy of the License at
+~~
+~~ http://www.apache.org/licenses/LICENSE-2.0
+~~
+~~ Unless required by applicable law or agreed to in writing,
+~~ software distributed under the License is distributed on an
+~~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+~~ KIND, either express or implied.  See the License for the
+~~ specific language governing permissions and limitations
+~~ under the License.
+
+ -----
+ ${project.name}
+ -----
+ Hervé Boutemy
+ -----
+ 2021-07-11
+ -----
+
+${project.name}
+
+ ${project.description}
+
+* References
+
+ * <<<mvn>>> invocation can be customised through:
+
+   * <<</etc/mavenrc>>> and <<<~/.mavenrc>>> scripts on Unix,
+
+   * <<<~\mavenrc_pre.bat>>> and <<<~\mavenrc_pre.cmd>>> scripts on Windows,
+
+   []
+
+  and these scripts calls can be disabled by setting <<<MAVEN_SKIP_RC>>> environment variable.