Automate releases

[jtpio]

Since releasing Galata only consists in publishing the package to npm, it should be possible to automate this workflow.

Either with a simple GitHub Actions workflow.

Or using the Jupyter Releaser: https://github.com/jupyter-server/jupyter_releaser

[jtpio]

Steps to adopt the releaser: https://github.com/jupyter-server/jupyter_releaser#checklist-for-adoption

Probably this will be rather simple to adopt since releasing Galata mostly consists in publishing the package to npm.

[jtpio]

Also we should check whether this will be necessary based on the discussion in jupyterlab/jupyterlab#10480.

But since the setup should hopefully be simple, it might still be worth doing it at least for now.

[jtpio]

With jupyterlab/jupyterlab#10796 Galata will be released along with the other @jupyterlab packages.