Add 3 groups to postgres

Author: hmstepanek

.github/workflows/tests.yml

@@ -226,12 +226,12 @@ jobs:
 
   postgres:
     env:
-      TOTAL_GROUPS: 2
+      TOTAL_GROUPS: 3
 
     strategy:
       fail-fast: false
       matrix:
-        group-number: [1, 2]
+        group-number: [1, 2, 3]
 
     runs-on: ubuntu-20.04
     timeout-minutes: 30
@@ -244,6 +244,7 @@ jobs:
         ports:
           - 8080:5432
           - 8081:5432
+          - 8082:5432
         # Set health checks to wait until postgres has started
         options: >-
           --health-cmd pg_isready