Issue with running rails 5(with webpack) selenium in bitbucket pipelines

[Vyivrain]

Hello, having issue with running headless chrome selenium. Locally everything works.

Basically this step of integration tests I want to run:

pipelines:
  default: 
    - step:
      name: Integration tests
      image: ruby:2.5.1
      caches:
        - bundler
        - node
      script:
        - export DATABASE_URL=postgresql://test_user:test_user_password@localhost/pipelines
        - bundle install --path vendor/bundle
        - mv config/deploy/database.ci.yml config/database.yml 

        # Install dependencies that chrome and chromedriver will need
        - apt-get update && apt-get install -yq libnss3 unzip openjdk-8-jre-headless xvfb      libxi6 libgconf-2-4

        # Install chrome browser and chromedriver
        - curl -sS -o - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add
        - echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >>  /etc/apt/sources.list.d/google-chrome.list
        - apt-get -y update
        - apt-get -y install google-chrome-stable
        - wget https://chromedriver.storage.googleapis.com/78.0.3904.70/chromedriver_linux64.zip
        - unzip chromedriver_linux64.zip
        - mv chromedriver /usr/bin/chromedriver
        - chown root:root /usr/bin/chromedriver
        - chmod +x /usr/bin/chromedriver 

        # Install node
        - apt-get -qq install gnupg
        - curl -sL https://deb.nodesource.com/setup_10.x | bash -
        - apt-get install -y build-essential
        - apt-get install -y nodejs
        - apt-get update 
        
        - npm install
        
        - RAILS_ENV=test bundle exec rspec spec/features/tests
        services:
          - postgres
          - redis

 This gives me error: 

Webpacker can't find platform in /opt/atlassian/pipelines/agent/build/public/packs-test/manifest.json 

Found that I possibly need to add a command before:

NODE_ENV=test bundle exec rails webpacker:compile

But after that another error rises:

TypeError: no implicit conversion of nil into String/opt/atlassian/pipelines/agent/build/config/application.rb:26:in `<class:Application>'

This looks like an error in app itself, but again running webpack compile locally works fine, so it doesn't look like problem with app code.

Anything I'm missing?