Add simple post commit reference model testing against Numpy

Only perform testing of this after build of ref model using postcommit pytest mark.

Signed-off-by: Jeremy Johnson <jeremy.johnson@arm.com>
Change-Id: I771a18d2c9cd4051fecafad3e6079b44f2ed62fa
diff --git a/setup.cfg b/setup.cfg
index 1e4c55d..a9dc3ab 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -60,6 +60,8 @@
 
 [tool:pytest]
 testpaths=verif/tests
+markers =
+    postcommit: marks tests for post commit testing on CI as part of the review
 
 [flake8]
 ignore = D213, E203, E266, E501, W503