[PostGIS] #6124: 3.7.0rc1 docs build failure without error message

[PostGIS]

#6124: 3.7.0rc1 docs build failure without error message
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  Reporter:  robe           |      Owner:  robe
      Type:  defect         |     Status:  reopened
  Priority:  blocker        |  Milestone:  PostGIS 3.7.0
 Component:  documentation  |    Version:  master
Resolution:                 |   Keywords:
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Comment (by strk):

 I'd like to point out that `make html` was intentionally made NOT to
 depend on generated images in the past, maybe so we should do the same for
 the "visual examples" here (PDF dpeends on those, HTML doesn't strictly
 do)
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6124#comment:5>
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