Run queue.process() in background

[6543]

Backported fix from #4114

before this it could happen that worklows that depend on other got stuck untill a new queue task was added

[6543]

could not reproduce that strange bug where tasks depending on other tasks get stuck in the queu, so I can not check if this here do solve it ...

If you set the agent to only query one and then exec it afterwards you have a stuck task that a new agent can not query. (this pull fix that, so it's a bugfix)

[codecov]

Codecov Report

Attention: Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release/v2.7@6f5e069). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
server/queue/fifo.go	89.65%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             release/v2.7    #4115   +/-   ##
===============================================
  Coverage                ?   26.87%           
===============================================
  Files                   ?      394           
  Lines                   ?    27566           
  Branches                ?        0           
===============================================
  Hits                    ?     7407           
  Misses                  ?    19454           
  Partials                ?      705           

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[woodpecker-bot]

Tearing down https://woodpecker-ci-woodpecker-pr-4115.surge.sh