Fix and cleanup Publish workflow

[jonaro00]

Issues

Fixes #1112

Proof of concept: https://github.com/jonaro00/alphaTab/actions/workflows/fixed_publish.yml

(Run # 8 is a cache miss, therefore the two publish jobs get run. Run # 9 is a cache hit, so both publish jobs are skipped.)

Proposed changes

• Fixed caching
• Fixed DRY
• Adjusted schedule to 10 minutes past midnight to reduce load
• Bumped setup-java to v3 (I have no idea if this breaks something)

Checklist

• I consent that this change becomes part of alphaTab under it's current or any future open source license
• Changes are implemented
• Existing builds tests pass
• New tests were added

Further details

• This is a breaking change
• This change will require update of the documentation/website

[Danielku15]

Thanks a lot for the change. Didn't really find the time myself to improve the workflows.