How can I create a custom Docker image for CircleCI?

How can I create a custom Docker image for CircleCI?

To create a custom Docker image for CircleCI, you need to define a Dockerfile that specifies the base image and any dependencies.

What should I include in my Dockerfile?

Your Dockerfile should include instructions like FROM, RUN, COPY, and CMD to set up your environment and application.

Can you give me an example of a simple Dockerfile?

Sure! Here's a simple example:

FROM node:14
WORKDIR /app
COPY package.json .
RUN npm install
COPY . .
CMD ["npm", "start"]

How do I use this Docker image in my CircleCI config?

In your CircleCI config file, you can specify your custom image under the 'docker' section like this:

docker:
  - image: yourusername/yourimage:tag