Move templates to RHEL/CentOS/UBI 8 and PostgreSQL 12

openshift/templates/django-postgresql-persistent.json

@@ -440,15 +440,15 @@
     {
       "name": "PYTHON_VERSION",
       "displayName": "Version of Python Image",
-      "description": "Version of Python image to be used (3.6 or latest).",
-      "value": "3.6",
+      "description": "Version of Python image to be used (3.6-ubi7, 3.6-ubi8, or latest).",
+      "value": "3.6-ubi8",
       "required": true
     },
     {
       "name": "POSTGRESQL_VERSION",
       "displayName": "Version of PostgreSQL Image",
-      "description": "Version of PostgreSQL image to be used (10 or latest).",
-      "value": "10",
+      "description": "Version of PostgreSQL image to be used (10-el8, 12-el8, or latest).",
+      "value": "12-el8",
       "required": true
     },
     {

openshift/templates/django-postgresql.json

@@ -421,15 +421,15 @@
     {
       "name": "PYTHON_VERSION",
       "displayName": "Version of Python Image",
-      "description": "Version of Python image to be used (3.6 or latest).",
-      "value": "3.6",
+      "description": "Version of Python image to be used (3.6-ubi7, 3.6-ubi8, or latest).",
+      "value": "3.6-ubi8",
       "required": true
     },
     {
       "name": "POSTGRESQL_VERSION",
       "displayName": "Version of PostgreSQL Image",
-      "description": "Version of PostgreSQL image to be used (10 or latest).",
-      "value": "10",
+      "description": "Version of PostgreSQL image to be used (10-el8, 12-el8, or latest).",
+      "value": "12-el8",
       "required": true
     },
     {

openshift/templates/django.json

@@ -251,8 +251,8 @@
     {
       "name": "PYTHON_VERSION",
       "displayName": "Version of Python Image",
-      "description": "Version of Python image to be used (3.6 or latest).",
-      "value": "3.6",
+      "description": "Version of Python image to be used (3.6-ubi7, 3.6-ubi8, or latest).",
+      "value": "3.6-ubi8",
       "required": true
     },
     {