i’m trying to add sidekiq to an existing docker-compose file (which runs fine) but as soon as I do it complains it cannot find the dockerfile. I’ve tried all sorts of variations in the build: section but can’t for the life of me get this to work correctly.

I’m running in portainer and the exact error is : failed to deploy a stack: failed to solve: failed to read dockerfile: open Dockerfile: no such file or directory.

Removing the nginx service from docker-compose does remove the error (just to confirm it works without)

Dockerfile

FROM ruby:3.3.0

# Directory where the app will be installed on the container
WORKDIR /app

# Install NodeJS 18 repository
RUN curl -fsSL https://deb.nodesource.com/setup_18.x | bash -

# Update the system and install NodeJS
RUN apt-get update && apt-get -y install 
    nodejs 
    vim 
    && rm -rf /var/lib/apt/lists/*

# Install ruby gems
COPY Gemfile Gemfile.lock ./
RUN bundle install


# Run `npm install`
COPY package.json package-lock.json ./
RUN npm install

# Copy the application file to the container
COPY . .

# temp secret key base
ENV SECRET_KEY_BASE_DUMMY="1"

# Pre-compile assets for production
RUN RAILS_ENV=production bundle exec rails assets:precompile

docker-compose.yml

services:
  app:
    build: .
    command: bundle exec rails s -p 3000 -e production -b '0.0.0.0'

    image: my/image:latest
    ports:
      - 3000:3000
    environment:
      - DB_HOST=db
      - DB_USERNAME=postgres
      - DB_PASSWORD=postgres
      - RAILS_ENV=production
      - RAILS_SERVE_STATIC_FILES=true
      - RAILS_LOG_TO_STDOUT=true
      - RAILS_MASTER_KEY=my_ultra_top_secret_master_key!!
      - JOB_WORKER_URL=redis://redis:6379/0

    depends_on:
      - db
      - redis

  sidekiq:
    build: .

    command: bundle exec rails sidekiq -e production
    links:
      - db
      - redis
    depends_on:
      - db
      - redis

  db:
    image: postgres:14
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
    volumes:
      - postgres:/var/lib/postgresql/data

  redis:
    image: redis:6.2-alpine
    command: redis-server
    volumes:
      - redis:/data
    ports:
      - 6379
    logging:
      driver: none

volumes:
  postgres:
  bundle:
  redis: