[PostGIS] #5666: Build reproducibility: timestamps in extension upgrade SQL scripts

[PostGIS]

#5666: Build reproducibility: timestamps in extension upgrade SQL scripts
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  Reporter:  James Addison  |      Owner:  pramsey
      Type:  defect         |     Status:  new
  Priority:  medium         |  Milestone:
 Component:  postgis        |    Version:  3.4.x
Resolution:                 |   Keywords:
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Changes (by James Addison):

 * Attachment "extension-upgrade-sql-reproducible.patch" added.

 Patch to read SOURCE_DATE_EPOCH during extension upgrade script
 templating.  Should have the value
 f1ca910dfcf382c01e0024a0419c9c49224b169bcff32ca09692f7de27c54f76 as
 sha256sum.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5666>
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