PR preview not building for members without write access

[ccarouge]

The action to deploy github pages only works for people with write access to the repository.

It seems there is an option to configure Git to a specific user which we could use so all PR are built from the same GitHub user account with writing access to the repository.

[ccarouge]

The action we are using is not set to work in this case. Some changes are in the works: rossjrw/pr-preview-action#3 but the changes are not yet ready for use.

[ccarouge]

There are a few options here:

1. give write access to all the organisation's members. Downside: requires a good vetting system of who becomes a member, any member could then create a repository in this organisation. Changes proposed by non-members would not have a preview.
2. leave it as is and remove the possibility to have a preview from the PR for people without write access. Downside: it can be hard to review changes correctly without a preview.
3. change the CI to be triggered on pull_request_target instead but only on PR with a specific label. Only people with write access can add a label to a PR. It would mean the label is typically added at the time of review. Downside: once the label is added, the originator of the PR can push any commit they want to their branch and have them run in the CI.
4. Use a 2 steps CI following what is proposed here. Downside: it is a lot more work and requires us to maintain the GitHub action ourselves.

[ccarouge]

For the now, we will go with the 3rd option above for ACCESS-Hive. We'll investigate the 4th option over the longer term.