default: &default
  endpoint: 'https://acme-staging.api.letsencrypt.org/directory'  # test server
  email: 'your@email.address'
  domain: "<%= ['example.com', 'www.example.com', 'another.example.com'].join(" ") %>"
  private_key: 'key/test-keyfile.pem'                   # in Rails.root
  output_cert_dir: 'certificates'                       # in Rails.root
  private_key_in_db: true

production:
  <<: *default

development:
  <<: *default

test:
  <<: *default

default: &default
  endpoint: 'https://acme-staging.api.letsencrypt.org/directory'  # test server
  email: 'your@email.address'
  domain: "<%= ['example.com', 'www.example.com', 'another.example.com'].join(' ') %>"
  private_key: 'key/test-keyfile.pem'                   # in Rails.root
  output_cert_dir: 'certificates'                       # in Rails.root
  private_key_in_db: true

production:
  <<: *default

development:
  <<: *default

test:
  <<: *default

Update quotes inside of the erb
Update quotes inside of the erb

They are now valid erb