Example DevFile for Rails

.devfile.rails.yaml

schemaVersion: 2.2.0
metadata:
  name: rails-blog
attributes:
  controller.devfile.io/devworkspace-config:
    name: special-workspaces-config
    namespace: l0rd-che
components:
  - name: bundle-volume
    volume:
      size: 1G
  - name: devtools
    container:
      image: quay.io/mloriedo/rails-blog-cde:latest
      memoryRequest: 2G
      memoryLimit: 4G
      cpuRequest: '1'
      cpuLimit: '2'
      env: 
        - name: RAILS_DEVELOPMENT_HOSTS
          value: '.apps.che-dev.x6e0.p1.openshiftapps.com'
      volumeMounts:
        - name: bundle-volume
          path: /home/user/.bundle/vendor
      endpoints:
        - name: blog
          exposure: public
          protocol: http
          targetPort: 3000
          path: /articles
commands:
  - id: bundle-install
    exec:
      component: devtools
      commandLine: bundle install
      workingDir: ${PROJECT_SOURCE}
  - id: server-start
    exec:
      component: devtools
      commandLine: bin/rails server -binding 0.0.0.0
events:
  postStart:
    - bundle-install

From: https://github.com/l0rd/rails-blog/blob/devfile/.devfile.yaml