"The most powerful tool we have as developers is automation."
— Scott Hanselman

This quote is quite true. Without automation, we would spend a lot of out time on things that would have to be done repetitively, for example, manually building and deploying your GitHub pages every time there is a change.

Luckily, you can easily use GitHub Actions to build and deploy your pages by just pushing your repository to GitHub! You don't even need to do anything except to add a configuration file to your repository.

In this post, I will be creating a workflow and using peaceiris/actions-gh-pages@v3 from GitHub Marketplace (it's free).

Getting your GitHub Access Token

We will need this token as we need to authorize the workflow to push to your repository. Make sure it has permission to write to your repositories (see this on how to get a token).

Now, head over to the repository where your project is located. Go to Settings > Secrets and select New Repository Secret. Name it ACCESS_TOKEN and put your token inside as the value. Click Add Secret. We can now access it by using ${{ secrets.ACCESS_TOKEN }}.

Setting up a workflow

Now, create a .github folder in your project and a workflows folder under it. Then, create a file named deploy.yml. Here's the base code:

name: Deploy to gh-pages

on:
  push:
    branches:
      - master

jobs:
    # ....

Now, create a job:

jobs:
  gh-pages-deploy:
    name: Deploying to gh-pages
    runs-on: ubuntu-latest # or macos-latest/windows-latest
    steps:
      # ...

Create steps that sets up Node.js and checks out the master branch (put the following under steps):

- name: Setup Node.js for use with actions
  uses: actions/setup-node@v1.1.0
  with:
    version:  16.8 # see https://github.com/actions/setup-node#supported-version-syntax for supported versions
  env:
    ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'
- name: Checkout branch
  uses: actions/checkout@v2
  env:
   ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'

Now, create the steps to install the dependencies and build the app:

- name: Clean install dependencies
  run: npm ci # or yarn install --frozen-lockfile for yarn
  # if the above doesn't work, use npm i or yarn
  env:
    ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'

- name: Build app
  run: npm run build
  env:
    ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'

You can replace npm run build with your project's command for building static pages, which is npm run generate for Nuxt.js.
Now, the final step for deploying:

- name: deploy
  uses: peaceiris/actions-gh-pages@v3
  with:
   github_token: ${{ secrets.ACCESS_TOKEN }}
   publish_dir: ./dist
  env:
   ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'

You can change ./dist for publish_dir to the directory your built pages are located. If you're not sure, run the build command locally to see where the pages are generated (e.g. for Vue.js and Nuxt.js, the publish_dir should be ./dist as the built pages are located there, but for VuePress, publish_dir should be <docs-dir>/.vuepress/dist).

Show the completed .github/workflows/deploy.yml file

name: Deploy to gh-pages

on:
  push:
    branches:
      - master

jobs:
    gh-pages-deploy:
      name: Deploying to gh-pages
      runs-on: ubuntu-latest
      steps:
        - name: Setup Node.js for use with actions
          uses: actions/setup-node@v1.1.0
          with:
            version:  16.8
          env:
            ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'
        - name: Checkout branch
          uses: actions/checkout@v2
          env:
           ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'

        - name: Clean install dependencies
          run: yarn install
          env:
            ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'

        - name: Build app
          run: yarn generate
          env:
            ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'

        - name: deploy
          uses: peaceiris/actions-gh-pages@v3
          with:
           github_token: ${{ secrets.ACCESS_TOKEN }}
           publish_dir: ./dist
          env:
           ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'

And that's it! Now every time you push your repository to GitHub, this workflow will run, and the built pages will be pushed to a branch named gh-pages in your repository.

Troubleshooting

If your go to your GitHub site (e.g. bob.github.io), you should see your page there. However, if you don't, try the following:

1. Ensure that your GitHub pages are deploying from the branch gh-pages. Go to Settings > Pages, and under source, there is a Branch option. Click it and select gh-pages.
2. Ensure that your gh-pages branch has an empty .nojekyll file in the root directory. If not, you can add one manually there (Make sure it's empty!).

Hope you enjoyed this post and that it has helped you!