docs: function checkImageExist(opts = { cwd: './', appConfig: null }) {
      if (this.abort) return;
  
      let imagePath = '';
      this.warning = false;
      this.warningMessage = 'To generate the missing Docker image(s), please run:\n';
      if (opts.appConfig.buildTool === 'maven') {
          imagePath = this.destinationPath(`${opts.cwd + opts.cwd}/target/docker`);
          this.dockerBuildCommand = './mvnw -Pprod verify jib:dockerBuild';
      } else {
          imagePath = this.destinationPath(`${opts.cwd + opts.cwd}/build/docker`);
          this.dockerBuildCommand = './gradlew bootWar -Pprod jibDockerBuild';
      }
  
      if (shelljs.ls(imagePath).length === 0) {
          this.warning = true;
          this.warningMessage += `  ${chalk.cyan(this.dockerBuildCommand)} in ${this.destinationPath(this.directoryPath + opts.cwd)}\n`;
      }
  }