Remove testing postgresql-container on OpenShift 3 (#556)

Signed-off-by: Petr "Stone" Hracek <[email protected]>

Author: phracek

.github/workflows/openshift-tests.yml

@@ -39,12 +39,7 @@ jobs:
       matrix:
         version: [ "10", "11", "12", "13", "15", "16" ]
         os_test: [ "rhel7", "rhel8", "rhel9"]
-        test_case: [ "openshift-3", "openshift-4" ]
-        exclude:
-          - test_case: "openshift-3"
-            os_test: "rhel8"
-          - test_case: "openshift-3"
-            os_test: "rhel9"
+        test_case: [ "openshift-4" ]
 
     if: |
       github.event.issue.pull_request