[postgis-tickets] [PostGIS] #4701: Travis: Add build based on PG REL_13_STABLE

[PostGIS]

#4701: Travis: Add build based on PG REL_13_STABLE
--------------------------+---------------------------
  Reporter:  Algunenano   |      Owner:  Algunenano
      Type:  enhancement  |     Status:  new
  Priority:  medium       |  Milestone:  PostGIS 3.1.0
 Component:  postgis      |    Version:  master
Resolution:               |   Keywords:
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Comment (by Algunenano):

 Currently building the images with the following branches:

 {{{
     dict(
         name='stable_pg13',
         PG='REL_13_STABLE',
         GEOS='3.8',
         GDAL='release/3.1',
         PROJ='7.1',
         PG_CC='clang'
     ),
     dict(
         name='stable_pg13',
         PG='REL_13_STABLE',
         GEOS='3.8',
         GDAL='release/3.1',
         PROJ='7.1',
         PG_CC='gcc'
     ),
 }}}

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4701#comment:2>
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