Firebase HostingとGithub Actionsで独自ドメインのHugoプロジェクトのブログを自動デプロイする

$ firebase init hosting
You're about to initialize a Firebase project in this directory:

  /path/to/${BLOG_DIR}


=== Project Setup

First, let's associate this project directory with a Firebase project.
You can create multiple project aliases by running firebase use --add, 
but for now we'll just set up a default project.

? Please select an option: Use an existing project
? Select a default Firebase project for this directory:
i  Using project ${GCP_PROJECT_ID}

=== Hosting Setup

Your public directory is the folder (relative to your project directory) that
will contain Hosting assets to be uploaded with firebase deploy. If you
have a build process for your assets, use your build's output directory.


## ${BLOG_DIR}からみた相対パス。PaperModの場合、public
? What do you want to use as your public directory? public


## シングルページではないのでNo
? Configure as a single-page app (rewrite all urls to /index.html)? No


## Yes
? Set up automatic builds and deploys with GitHub? Yes
✔  Wrote public/404.html
✔  Wrote public/index.html
i  Detected a .git folder at /path/to/${BLOG_DIR}
i  Authorizing with GitHub to upload your service account to a GitHub repository's secrets store.

Visit this URL on this device to log in:
********  <--- 表示されるURLからFirebase CLIからGithubのログイン認証を終える

Waiting for authentication...

✔  Success! Logged into GitHub as ${GITHUB_USERNAME}


##　${GITHUB_USERNAME}/${BLOG_DIR}
? For which GitHub repository would you like to set up a GitHub workflow? (format: user/repository) ${GITHUB_USERNAME}/${BLOG_DIR}

✔  Created service account ******** with Firebase Hosting admin permissions.
✔  Uploaded service account JSON to GitHub as secret ********
i  You can manage your secrets at https://github.com/${GITHUB_USERNAME}/${BLOG_DIR}/settings/secrets.

## 後ほど自分で書くのでNo
? Set up the workflow to run a build script before every deploy? No

✔  Created workflow file /path/to/${BLOG_DIR}/.github/workflows/firebase-hosting-pull-request.yml


## Yes
? Set up automatic deployment to your site's live channel when a PR is merged? Yes


## main (Firebase Hostingへデプロイするときのブランチ)
? What is the name of the GitHub branch associated with your site's live channel? main

✔  Created workflow file /path/to/${BLOG_DIR}/.github/workflows/firebase-hosting-merge.yml

i  Action required: Visit this URL to revoke authorization for the Firebase CLI GitHub OAuth App:
********
i  Action required: Push any new workflow file(s) to your repo

i  Writing configuration info to firebase.json...
i  Writing project information to .firebaserc...

✔  Firebase initialization complete!