Git lab ci need to be able to test 2.2 or turn off

[robe]

First of all I had to upgrade Git lab ci to use 9.6, because for the image in use, there is no lower PostgreSQL version it seems.

However we can't use 9.6 because 2.2 only is guaranteed to support compile, and you can see why cause topology fails

https://gitlab.com/postgis/postgis/-/jobs/60603994

regress/gml .. failed (diff expected obtained: /tmp/pgis_reg/test_42_diff)
-----------------------------------------------------------------------------
--- regress/gml_expected	2018-04-02 03:55:01.000000000 +0000
+++ /tmp/pgis_reg/test_42_out	2018-04-02 04:01:18.000000000 +0000
@@ -55,8 +55,8 @@
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-----------------------------------------------------------------------------
 regress/getnodebypoint .. ok 
 regress/getedgebypoint .. ok 
 regress/getfacebypoint .. ok 
 regress/getringedges .. ok 
 regress/gettopogeomelements .. ok 
 regress/layertrigger .. ok 
 regress/validatetopology .. ok 
 uninstall .  /builds/postgis/postgis/regress/00-regress-install/share/contrib/postgis/uninstall_topology.sql
  /builds/postgis/postgis/regress/00-regress-install/share/contrib/postgis/uninstall_postgis.sql
. ok (4581)

Run tests: 50
Failed: 1
make[2]: *** [check] Error 1
Makefile:84: recipe for target 'check' failed
make[2]: Leaving directory '/builds/postgis/postgis/topology/test'
Makefile:109: recipe for target 'check' failed
make[1]: Leaving directory '/builds/postgis/postgis/topology'
make[1]: *** [check] Error 2
make: *** [check] Error 1
GNUmakefile:16: recipe for target 'check' failed
ERROR: Job failed: exit code 1

Can we upgrade gitlab to use same image as drone so it can test 9.5?

[strk]

In 16518:

Copy Topology GML regression tests from 2.3 branch

Hopefully fixes #4062 in 2.2 branch bringing in controlled order
to make tests behave the same under different PostgreSQL versions