How can I use Docker with CircleCI?

How can I use Docker with CircleCI?

You can use Docker in CircleCI by defining a Docker executor in your config.yml file. Would you like a sample configuration?

Yes, please provide a sample configuration.

Here's a basic example:

version: 2.1
executors:
  docker-executor:
    docker:
      - image: circleci/python:3.8
jobs:
  build:
    executor: docker-executor
    steps:
      - checkout
      - run: echo "Hello, Docker!"
workflows:
  version: 2
  build:
    jobs:
      - build

This config uses a Python Docker image. Do you need help with anything else?

How do I build a custom Docker image in CircleCI?

To build a custom Docker image, you can add a step in your job to build the image using a Dockerfile. Would you like to see an example?