We can create Jenkinsfile for our project using the ci-cd sub-generator from JHipster:

1. In a Terminal, navigate to the online-store folder first. Now run the following command:

> jhipster ci-cd

2. You will be asked to select from a list of options, as follows:

Welcome to the JHipster CI/CD Sub-Generator
? What CI/CD pipeline do you want to generate? (Press <space> to select, <a> to toggle all, <i> to inverse selection)
>◯ Jenkins pipeline
 ◯ Azure Pipelines
 ◯ Travis CI
 ◯ GitHub CI
 ◯ GitLab CI

3. Let's select Jenkins pipeline from it. Next, we can choose to run the build inside a Docker container. Let's choose No here:

Welcome to the JHipster CI/CD Sub-Generator
? What CI/CD pipeline do you want to generate? Jenkins pipeline
? Would you like to perform the build in a Docker container ? (y/N)

4. The next question will be about sending build status to GitLab—choose No for that as well:

? What CI/CD pipeline do you want to generate? Jenkins pipeline
? Would you like to perform the build in a Docker container ? No
? Would you like to send build status to GitLab ? No

5. Next, we will have an option to choose additional stages. Let's choose the Deploy to *Heroku* option here to automatically deploy to Heroku from our CI/CD pipeline:

? What CI/CD pipeline do you want to generate? Jenkins pipeline
? Would you like to perform the build in a Docker container ? No
? Would you like to send build status to GitLab ? No
? What tasks/integrations do you want to include ? (Press <space> to select, <a> to 
toggle all, <i> to invert selection)
>◯ Deploy your application to an *Artifactory*
 ◯ Analyze your code with *Sonar*
 ◯ Build and publish a *Docker* image
 ◯ Deploy to *Heroku* (requires HEROKU_API_KEY set on CI service)

6. Let's provide a name to deploy; we can change it later if required:

? What CI/CD pipeline do you want to generate? Jenkins pipeline
? Would you like to perform the build in a Docker container ? No
? Would you like to send build status to GitLab ? No
? What tasks/integrations do you want to include ? Deploy to 
  *Heroku*
? *Heroku*: name of your Heroku Application ? store

Once the options are selected, JHipster will generate the files and log the following output on the console:

   create Jenkinsfile
   create src/main/docker/jenkins.yml
   create src/main/resources/idea.gdsl
Congratulations, JHipster execution is complete!

As you can see, we got Jenkinsfile generated at the root and a Docker image for Jenkins created in the src/main/docker directory. We also got an idea.gdsl file, which is used by IntelliJ IDEA for autocompletion.