Upload workflow artifacts to prerelease

[Vinfall]

Upload workflow artifacts to a prerelease tagged "nightly", so users can download nightly builds without login. I did not touch REAMDE as you may still find nightly.link useful somehow.

It's also possible to use commit hash or whatever as tag name, simply change tag: "nightly" in this part. I set it to nightly as I prefer a permalink like https://github.com/LibreHardwareMonitor/LibreHardwareMonitor/releases/download/nightly/LibreHardwareMonitor-net472.zip:

      - name: Upload artifact to prerelease
        uses: ncipollo/release-action@v1
        with:
          # Only update attachments on "nightly" tag
          prerelease: True
          tag: "nightly"
          updateOnlyUnreleased: True

I tested net472 & net60 locally and they worked fine on my machine.

[Vinfall]

Hmm, in case I did not make it clear. #1279 only updates action versions and what you suggested is actually in this PR.

[Vinfall]

Closed due to inactivity, feel free to reach out if you ever decide to ship nightly via prerelease.