Update config.yml

[jdorsheimer]

Change added

[github-learning-lab]

Nice work getting this pull request opened!

This pull request updates the .circleci/config.yml configuration file. This file is necessary to return a successful build and where we define how to build and test the code.

All projects have different needs, ranging from standard unit tests to custom configuration. Regardless of the definition of "success" for your project, this is the place to define it.

There isn't much in this file right now, but we're going to change that. We'll make a change to configure the build environment.

Notice that this configuration file includes a Docker image to execute the build, defining the environment. There's also a checkout command that allows CircleCI to access your project.

CircleCI is only triggered by new commits. To trigger CircleCI, add the below text in place of the REPLACE-ME-WITH-DOCKER-IMAGE placeholder:

githubtraining/ci-custom:latest

Step 3: Specify the Docker image

To get the CI build to succeed, replace the placeholder text and commit the change.

⌨️ Activity: Select a specific configuration

1. In this pull request, replace the placeholder text with githubtraining/ci-custom:latest. You can do this by editing the file from the Files changed tab, or by scrolling down and accepting the suggested change.

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[github-learning-lab]

Suggested change

	- image: REPLACE-ME-WITH-DOCKER-IMAGE
	- image: githubtraining/ci-custom:latest