Github Action for PRs is not testing the code from the PR neither deploying the test website from it

[clopez]

The current Github Action is checking out the code from master instead of checking out the code from the PR that is the one that should be tested and deployed on the test URL.

See example of wrongdoing: https://github.com/Igalia/wpewebkit.org/actions/runs/15057304460/job/42325774952 (from PR #259)

Run actions/checkout@v3
Syncing repository: Igalia/wpewebkit.org
Getting Git version info
Temporarily overriding HOME='/home/runner/work/_temp/cc75343e-bb47-4a97-b36c-1646add25a2a' before making global git config changes
Adding repository directory to the temporary git global config as a safe directory
/usr/bin/git config --global --add safe.directory /home/runner/work/wpewebkit.org/wpewebkit.org
Deleting the contents of '/home/runner/work/wpewebkit.org/wpewebkit.org'
Initializing the repository
Disabling automatic garbage collection
Setting up auth
Fetching the repository
Determining the checkout info
Checking out the ref
/usr/bin/git log -1 --format='%H'
'5c1ecd97a563fa7c3705e6a7c236063270313053'

And 5c1ecd9 is current master, not the HEAD from the PR that has to be tested

[clopez]

I tried to fix that in #260 which I later closed because I thought it could be related to trying to checkout the code from a fork which might be forbidden due to potential security issues, but when I tried the same PR from a branch in this same repo the same happened #261

So I'm still not sure what is the issue. I added a new step there as well to see some debug info but is not trigerring the new step, likely also related to pull_request_target instead of pull_request which makes sense that one can't update the action from the PR.