code: public TomcatBoot configure(String configFile, String... extendsConfigFiles) {
          if (configFile == null || configFile.trim().length() == 0) {
              throw new IllegalArgumentException("The argument 'configFile' should not be null or empty: " + configFile);
          }
          if (extendsConfigFiles == null) {
              throw new IllegalArgumentException("The argument 'extendsConfigFiles' should not be null or empty: configFile=" + configFile);
          }
          this.configFile = configFile;
          this.extendsConfigFiles = extendsConfigFiles;
          return this;
      }
docs: You can configure tomcat options by application properties.
  <pre>
  boot.configure("fortress_config.properties", "fortress_env.properties");
  </pre>
  @param configFile The path of configuration file in classpath. (NotNull)
  @param extendsConfigFiles The paths of super configuration files. (NotNull, EmptyAllowed)
  @return this. (NotNull)