[BDGR-173] Add new automated release workflow

[markspolakovs]

(Pretend you never saw the literally 35 commits I squashed into this one...)

New release process:

1. Push a tag matching vx.x.x-rc.x
2. Actions builds Server/Jobrunner docker images and Windows Desktop builds
3. Runs tests (THIS IS THE COOL BIT - it runs the E2E server/desktop tests on the build it just made)
4. Automatically files a Linear ticket with a testing checklist (using a template on the team) and waits for approval

• Currently I'm the only approver but this can easily be changed

5. When approved, pushes the docker images to :latest and creates a GH release without the -rc suffix

Fixes BDGR-173

[github-actions]

	Fails
🚫	TODOs without issue key. Please file a Linear ticket and add the number to the comment: + stateId: "${{ vars.LINEAR_TODO_STATE_ID }}",

	Warnings
⚠️	No Linear ticket found. Please include one in either the pull request title (e.g. [BDGR-123] Fix something), the description (Fixes BDGR-123.), or the branch name (bow-123-fix-something).

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[markspolakovs]

Version setting doesn't seem to be working, sad panda