Github action for nightly build and to make release

[Loup-Garou911XD]

Steps

• Write a good description of what your PR does (and WHY it does it).
• Add yourself to CONTRIBUTORS if you are a new contributor.
• Add a CHANGELOG entry if your change is non-trivial.
• Ensure make preflight completes successfully.

Description

• Added github action to build docker image and sphinx docs nightly instead of on every commit to save time on checks
• Added github action to release build files on tag push
• Added some comments to makefile docker targets

Type of Changes

	Type
✓	✨ New feature

[Loup-Garou911XD]

should we build every thing nightly or just docs and docker image?
also should deploy docs also be run nightly instead of every commit?

[Loup-Garou911XD]

@efroemling should the releases be release build or debug build??

[Loup-Garou911XD]

here if you want to see how release looks

[Loup-Garou911XD]

you can edit the body of release manually to highlight major changes or i can write a script that gets everything from CHANGELOG.md like i did here on plugman repo
In my opinion the latter is not suitable here as the full changelog can be overwhelming

[efroemling]

Thanks for this!