title: does an external script in rpm-maven-plugin have access to maven properties
body: <p>In an external <code>postinstallScriptlet</code> as follows, is there a way to access maven properties such as <code>${project.artifactId}</code>? The pom.xml file has this snippet:</p>
  
  <pre><code>&lt;postinstallScriptlet&gt;
      &lt;scriptFile&gt;scripts/postinstall.sh&lt;/scriptFile&gt;
      &lt;fileEncoding&gt;utf-8&lt;/fileEncoding&gt;
  &lt;/postinstallScriptlet&gt;
  </code></pre>