ci: add pull request previews

[jboix]

Description

Addresses srgssr/pillarbox-web#196 by introducing pull request previews using rossjrw/pr-preview-action. This new workflow enables us to review both visual and functional changes before merging.

The preview functionality work in the following manner:

1. Triggering a Preview: Whenever a pull request is either opened, re-opened, or updated, the project undergoes a build process. The contents of the dist directory are copied under pr-preview/pr-${github.ref} located in the gh-pages branch.

2. Cleaning Up: Once a pull request is closed, the corresponding preview folder (specific to the closed pull request) is deleted.

Changes made

• The JamesIves/github-pages-deploy-action has been updated from version 3 to version 4. This update introduces the following configurations to this action:
  • force: false: This disables force push to the deployment branch.
  • clean-exclude: pr-preview/: This prevents the deletion of PR previews when the main branch is deployed.

[github-actions[bot]]

PR Preview Action v1.4.7 :---: Preview removed because the pull request was closed. 2024-02-20 15:57 UTC