Initial commit for new 1.6 release with Postgres 13 support. (#1257)

* Initial commit for new 1.6 release with Postgres 13 support.
* Updating maintainers, Go version, Codeowners.
* Use lazy upgrade image that contains pg13.
* fix typo for ownerReference
* fix clusterrole in helm chart
* reflect GCP logical backup in validation
* improve PostgresTeam docs
* change defaults for enable_pgversion_env_var and storage_resize_mode
* explain manual part of in-place upgrade
* remove gsoc docs

Co-authored-by: Felix Kunde <felix-kunde@gmx.de>

ui/manifests/deployment.yaml

@@ -68,10 +68,8 @@ spec:
                   "cost_core": 0.0575,
                   "cost_memory": 0.014375,
                   "postgresql_versions": [
+                    "13",
                     "12",
-                    "11",
-                    "10",
-                    "9.6",
-                    "9.5"
+                    "11"
                   ]
                 }

ui/operator_ui/main.py

@@ -303,7 +303,7 @@ DEFAULT_UI_CONFIG = {
     'users_visible': True,
     'databases_visible': True,
     'resources_visible': True,
-    'postgresql_versions': ['9.6', '10', '11'],
+    'postgresql_versions': ['11','12','13'],
     'dns_format_string': '{0}.{1}.{2}',
     'pgui_link': '',
     'static_network_whitelist': {},