public Builder executor() {
    return new Builder(gfshContexts::add, errors::add, folder.toPath());
  }
Returns a builder for a {@link GfshExecutor} that uses this {@code GfshRule}'s folder as the
working directory for invoked processes.

@return the builder
geode-junit/src/main/java/org/apache/geode/test/junit/rules/gfsh/GfshRule.java