The status badge for onlabel_CRAN_checks always picks up the latest run

[j-i-l]

Since we use the onlabel_CRAN_checks workflow on label of pull requests we end up with a status badge on the homepage of the package that indicates the status for some pull request and not for a version we would like to display.

The check should either indicate the state when running on main or on the latest release-x.y.z branch that has a published tag.

Since the workflow runs on pull requests, it never runs on main directly.

What we could do it so simply update the URI for the badge in the README.md when we create a new release-x.y.z pull request, much like we already do when updating the NEWS.md file.
When we then publish the version by merging the pull request the badge in the README.md will points to the outcome of the latest onlabel_CRAN_checks on the branch release-x.y.z of the latest release.