ci: auto tag and release on 'release vX.X.X' commit

[mcanouil]

This PR proposes a GitHub Action to tag and make a GitHub release with GitHub changelog on commits following the pattern 'release vX.X.X'.
GHA is triggered by a commit message starting with 'release'.
Tag/Release name are set with anything after 'release ', i.e., from 'release vX.X.X' commit message, the tag will be 'vX.X.X'.

Fixes #58

[jjallaire]

Thanks!!! One other thing we should almost certainly do is attach the actual VSIX file to the release (which will provide a nice archive of previous release -- currently something you need to traverse the repo history for). Eventually we should actually build the VSIX in CI and stop checking it in to the repo but that can be for another day.

[mcanouil]

To note, from VSCode anyone can install any previous version of any extension without having to go to the repository nor marketplace.
This is why, I thought for now a simple tag/release would be enough (also this reduces the amount of stuff to store on data servers).

Screen.Recording.2022-08-15.at.15.16.48.mov

[mcanouil]

@eitsupi & @jjallaire Maybe the GHA from the vscode-r extension could be used (or at least serve as a basis)?
It could be combined with my proposed GHA which could lead to the following workflow:

1. commit message: 'release vX.X.X'
2. build vscode-quarto
3. set tag from commit message
4. set release
5. publish to Visual Studio Marketplace

(if the build step fails, there is no tag/release)

https://github.com/REditorSupport/vscode-R/blob/master/.github/workflows/release.yml

[eitsupi]

To note, from VSCode anyone can install any previous version of any extension without having to go to the repository nor marketplace.

Visual Studio Marketplace is only available from Microsoft products.
In general, you must use Open VSX or install directly except for Microsoft products.

The Julia extension seems to automatically make releases to both Visual Studio Marketplace and Open VSX.
https://github.com/julia-vscode/julia-vscode/blob/d7b219cb42611162aa8f20fa9d5e5042e7fcb8c2/.github/workflows/main.yml

[mcanouil]

I see thanks for the information.

https://github.com/REditorSupport/vscode-R/blob/master/.github/workflows/release.yml

By the way, for vscode-r, the Open VSX was disabled (commented) last month in the GHA workflow for some reason