[PostGIS] #6047: cirrus parse error parsing "${NCPU}": invalid syntax

[PostGIS]

#6047: cirrus parse error parsing "${NCPU}": invalid syntax
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  Reporter:  robe          |      Owner:  robe
      Type:  defect        |     Status:  new
  Priority:  medium        |  Milestone:  PostGIS 3.7.0
 Component:  QA/buildbots  |    Version:  3.4.x
Resolution:                |   Keywords:
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Comment (by robe):

 I thought this was giving an error in master too, but seems not to be so
 I'll leave the setting in master.

 Maybe in the other it was specified in the wrong place.  Anyway I'm going
 to reduce the number of CPU to save on cycles, we don't need 8 to test.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6047#comment:2>
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