Secrets in GitHub Actions

In simple terms, a ‘secret’ is data that’s encrypted and hidden from view, but still useable in your projects. Secrets could be sensitive data about your business or a verification method, such as an API key to connect with other services in your pipeline.

GitHub allows you to store secrets at 3 different levels:

• Repository
• Environment
• Organization

In this post, we look at those 3 levels and how to add secrets to them. We also look at how to call secrets in an example workflow.

Repository secrets

GitHub ties repository secrets to only one repository. They’re available to anyone with the collaborator role to use in actions.

You can store 100 secrets per repository.

Add a repository secret

1. Open your project’s repository in GitHub and click Settings in the top menu.
2. Click Secrets in the left menu.
3. Click New repository secret.
4. Complete the following fields and click Add secret:
   • Name - give your secret a suitable name. You can’t use spaces or special characters other than underscores.
   • Value - enter the secret, such as your API key.

You can update the value of your secret at any time. Return to Secrets in the repository menu and click Update on the secret you need to change.

Environment secrets

Like with Octopus, you can set GitHub to deploy to your pipeline’s deployment targets with environments.

If your repo is public or you have an enterprise license, you can set environment-specific secrets that only work for that one environment.

You can store 100 secrets per environment.

Add a secret when creating a new environment

1. Open your project’s repository in GitHub and click Settings in the top menu.
2. Click Environments in the left menu.
3. Click New environment.
4. Enter a name for your environment and click Configure environment.
5. Set the environment’s protection rules and deployment branches as you need, then click Add secret.
6. Complete the following fields and click Add secret:
   • Name - give your secret a suitable name. You can’t use spaces or special characters other than underscores.
   • Value - enter the secret, such as your API key.

Add a secret to an existing environment

1. Open your project’s repository in GitHub and click Settings in the top menu.
2. Click Environments in the left menu.
3. Select the environment you need to set a secret for.
4. Click Add secret at the bottom of the page.
5. Complete the following fields and click Add secret:
   • Name - give your secret a suitable name. You can’t use spaces or special characters other than underscores.
   • Value - enter the secret, such as your API key.

Organization secrets

1. Open your organization’s page in GitHub and click Settings in the top menu.
2. Click Secrets in the left menu.
3. Click New organization secret.
4. Complete the following fields and click Add secret:
   • Name - give your secret a suitable name. You can’t use spaces or special characters other than underscores.
   • Value - enter the secret, such as your API key.
   • Repository access - select a policy from the dropdown list. You can restrict use to either public or private repos, or manually select them.

Using secrets in GitHub Actions workflows

You use the secrets context to call your secret data in workflows. Contexts are what GitHub uses to pull information from its various sources, including workflows, jobs, and steps. See GitHub’s documentation for the full list of contexts.

As an example, if you want to send a package over to an Octopus server for deployment as part of your workflow, you can use the secrets context, along with the secrets’ names, to connect your workflow to Octopus.

- name: Push Package to Octopus
   uses: OctopusDeploy/push-package-action@v1.0.0
   with:
       api_key: ${{ secrets.OCTOPUS_TEST_API }}
       packages: ${{ steps.package.outputs.artifacts }}
       server: ${{ secrets.OCTOPUS_PACKAGE_STORE }}

To explain what’s happening, this part of the workflow:

1. Triggers an action to push the package to Octopus.
2. Gets the Octopus API key from your secrets store to allow GitHub to pass data to Octopus.
3. Packages your artifacts as per your action’s steps.
4. Gets the hidden package destination from your secrets store.

Here the workflow uses both your API and destination but keeps them hidden from view.

Conclusion

Secrets are a great security measure that allow you to protect data and connect to services without revealing sensitive information.

What's next?

We recommend you see GitHub’s documentation for:

• More information about secrets
• GitHub Actions’ contexts
• GitHub Actions’ syntax

If you haven’t already, check out some of our other blogs in this Continuous Integration series.

Octopus has also built a useful GitHub Actions workflow generator to help you build a CI pipeline for GitHub.

Try our free GitHub Actions workflow tool to help you quickly generate customizable workflows for your GitHub Actions deployments.

Watch our GitHub Actions webinar

Read the rest of our Continuous Integration series.

Happy deployments!