Make the list of available versions dynamic. The items displayed is now
generated with javascript. The parent directory of the site is supposed
to contain versions.js providing getVersionListItems() that returns the
available versions.
The update-gh-pages.sh script is modified to update/create versions.js
on every invocation. It simply lists all directories in the root
directory and adds them to the version list.
Add 'scripts/github/update-gh-pages.sh' for updating gh-pages branch.
This new script intended for github actions integration and builds the
html documentation from the currently checked-out commit and updates the
corresponding version subfolder in the gh-pages branch. The version is
taken from GITHUB_REF environment variable and defaults to 'master' if
the env var is empty. For testing purposes or manual updates the
subfolder can also be given directly as a command line argument.
Add 'scripts/test-infra/build-gh-pages.sh' for verifying that site
(gh-pages) builds successfully. This is intended for integration with
kubernetes test-infra.
Finally, add Github workflow for updating gh-pages. This job is run on
master and release branches plus all tags starting with letter 'v'.
