wercker.yml to deploy heroku

wercker.yml

box: wercker/nodejs
# Build definition
build:
  # The steps that will be executed on build
  steps:
    # A step that executes `npm install` command
    - npm-install
    # A step that executes `npm test` command
    #- npm-test
    - add-to-known_hosts:
        hostname: heroku.com
    - script:
        name: make .ssh directory
        code: mkdir -p "$HOME/.ssh"
    - create-file:
        name: write private key
        filename: $HOME/.ssh/id_rsa
        content: $HEROKU_PRIVATE
        overwrite: true
        hide-from-log: true
    - script:
        name: set permissions to private key
        code: chmod 0400 $HOME/.ssh/id_rsa
    - script:
        name: clone from heroku
        code: |
          git clone $GET_REPOS dist
    - script:
        name: install grunt and bower
        code: |
          npm install grunt-cli
          npm install bower
    - script:
        name: bower install
        code: |
          node_modules/bower/bin/bower install
    - script:
        name: grunt build 
        code: |
          node_modules/grunt-cli/bin/grunt build
    - script:
        name: set  up git repository
        code: |
          git config --global user.name "$GIT_USER_NAME"
          git config --global user.email "$GIT_USER_EMAIL"
    - script:
        name: deploy to heroku
        code: |
          cd dist
          git add . -A
          git commit -m "$GIT_COMMIT_MESSAGE"
          git push origin master