[PostGIS] #5689: Set PostGIS windows bundle environment for service rather than machine.

[PostGIS]

#5689: Set PostGIS windows bundle environment for service rather than machine.
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  Reporter:  slefranc     |      Owner:  robe
      Type:  enhancement  |     Status:  new
  Priority:  medium       |  Milestone:  PostGIS Packaging
 Component:  install      |    Version:  3.4.x
Resolution:               |   Keywords:  windows
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Comment (by robe):

 I'm prepping to release the PostGIS 3.4.3 bundle with updates GDAL 3.8.5,
 pgRouting 3.6.2, and mobilitydb  1.1.1. I really wanted to get this change
 in this cycle, but I'm running into challenges with this formulating this
 in my NSIS installer.

 The main issue is the regular environment variables, I can specify one at
 a time, but looks like with services, I've got to put it all in a single
 entry and in binary format.

 This poses two issues

 1) Just getting it in there
 2) How to not clobber entries e.g. put in by something else since it's
 just a single blob.

 I think it's doable but given the difficulty, I may need to punt this to
 3.5 so I can get the installers out soon and also given this may not be
 that trivial of a change and might have other consequences.
-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/5689#comment:4>
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