Gitpod/OpenVSX Support?

Just learned that only extensions published to the [OpenVSX](https://open-vsx.org/) registry will work on[ Gitpod](https://gitpod.io), and was curious if the maintainers of this repo would be interested in publishing there as well.

The steps for doing so are listed [here](https://github.com/eclipse/openvsx/wiki/Publishing-Extensions). 1-4 have to do with setting up an account and generating a token, then the last step discusses how to actually perform the publish.

It seems like updating the Github workflow publish pipeline to also publish to OpenVSX could look something like [this](https://github.com/github/vscode-codeql/blob/main/.github/workflows/release.yml#L150).

Inspect the GitHub workflow publish pipeline and compare its release step with the linked CodeQL workflow example. Review OpenVSX's publishing steps, then verify that the configured token can publish the extension there alongside the existing registry; done means Gitpod can install the published extension.

Written by the indexing model from the issue text.