[Flutter] Setup CI on Gitlab for Flutter Web

I'm trying to setup CI on Gitlab for Flutter Web. My `. But it does not build the web app.

cirrus.yml` file:

image: cirrusci/flutter:latest

variables:
before_script:
- flutter channel beta
- flutter upgrade
- flutter config --enable-web
- flutter pub get
pages:
stage: deploy
script:
- flutter build web
- cp -r build/web public
artifacts:
paths:
- public
only:
- live


Pipeline doesn't start automatically. When I ran it manually, I'm getting following error:

No stages / jobs for this pipeline.
Specify variable values to be used in this run. The values specified in CI/CD settings will be used by default.

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