chore(actions): update and restructure actions

[supermaxiste]

Changes:

• All actions are updated to their latest version
• All yml files are using consistent formatting and versions
• docker-publish now triggers only for build&push for any changes to main (before it would build+build&push)
• sphinx-docs now triggers build for PRs when docs/** changes and build+push for any changes to main

[cmdoret]

Awesome, looks much better now! Thanks for taking the time to bump action versions 🙌

[cmdoret]

Ah great! Thanks for this :)

[rmfranken]

Nice work guys!! Kinda curious what's going on with this, seems like an awefully long time to publish no?

soon we can implement the new and released gimie on IP 😄

[supermaxiste]

@rmfranken it is indeed long, but this action will not trigger most of the time 😄 currently it's setup to trigger only when dependencies, github action files or dockerfiles change.
Note that the title of the action has "Publish" in it, but in this case it's the building the container without publishing. Publishing happens only for changes to main.