Adding weekly run to update draft features by spec

[tropicadri]

Adds a workflow to run update-drafts one a week and create a PR with the updates.

I created a copy repo and let the workflow run to have an example of the PR it creates: tropicadri/ga-test#3

[foolip]

Yep, that's as good a time as any! I'll also add workflow_dispatch so that we can trigger this manually at any time. Often useful for ensuring everything works after a change to the script or workflow.

[foolip]

Thank you @tropicadri! Let's land this and get spec drafts updating.

[foolip]

@tropicadri looks like there's a problem. In https://github.com/web-platform-dx/web-features/actions/runs/10117116884/job/27981430193#step:7:92 the error is "GitHub Actions is not permitted to create or approve pull requests".

I haven't seen this before, but I guess we need to give it permissions...

[tropicadri]

Ah yes, I enabled write permissions for the test repo that I created, but it seems the organization might also need to be configured to allow write pull requests, but it also needs to be a repo admin, so I couldn't set it up.

Go to https://github.com/organizations/web-platform-dx/settings/actions and check Allow GitHub Actions to create and approve pull requests
Then go to https://github.com/web-platform-dx/web-features/settings/actions and check the box that previously was grayed out

[foolip]

@tropicadri do you know if #1517 might work, or if one also has to enable it in the GitHub settings? I don't have access to https://github.com/organizations/web-platform-dx/settings/actions, I'd need to ask W3C staff.