dashboard: Fetch data whenever a PR is merged into main

[afinn12]

MUST:

• Add token to Github secrets to increase rate limits for fetch scripts
• Confirm whether to track the .yaml script for the fetch workflow
  • And whether to keep the commented out PR fetch script as a note

Context:
If we merge a PR to main that assumes that new data is required (e.g. the PR runs view feature), the website will be updated immediately, but the data will take up to 24 hours to refresh. However, we need the new data.

Solution:
On any push to the main branch that updates "scripts/fetch-ci-data-nightly.js", the fetch workflow will be triggered (includes merges).

ADDITIONAL:
Since the Nightly tests are only run nightly, we only need to fetch the script once a day.
The PR data changes whenever a PR is made, so we could add:

  pull_request:
    branches:
      - main

This will fetch data whenever a new PR is made (might need to set a delay to let tests finish)

[sprt]

I thought of doing this but decided against it: we risk needlessly going over the GH rate limit in case we merge a bunch of PRs that don't affect the data schema.

But, can we implement this in a way that it only triggers the workflow if the fetching script is modified? If we do that, do you see any potential issue with that approach?

[sprt]

Also if you decide to pursue this PR, please only keep the commit that's relevant to the title, so we minimize the PR size.

[afinn12]

Should be implemented with your suggested changes.

[a1icja]

One quick change!

[sprt]

@afinn12 Can you fix the commit message check and also include "Fixes: #7" in your commit message so the issue is automatically closed?