apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/component/emailbuilder/ConfigPublishEmailBuilder.java/ConfigPublishEmailBuilder/renderEmailCommonContent
class ConfigPublishEmailBuilder:  protected String renderEmailCommonContent(Env env, ReleaseHistoryBO releaseHistory) {
    String template = getTemplateFramework();
    String renderResult = renderReleaseBasicInfo(template, env, releaseHistory);
    renderResult = renderDiffModule(renderResult, env, releaseHistory);
    return renderResult;
  }