Update postgres in config samples and bkp/restore

Update postgres to 15 in CR samples, bkp and restore controllers.
This is a workaround to be able to make the CI green and publish
version 1.3.0 while we work on the issue with postgres 13 upgrade.

[noissue]

Author: git-hyagi

config/samples/external_db.yaml

@@ -49,7 +49,7 @@ spec:
     spec:
       containers:
         - name: postgres
-          image: postgres:13
+          image: postgres:15
           imagePullPolicy: "IfNotPresent"
           envFrom:
           - secretRef:

config/samples/k8s_versions_ci.yaml

@@ -36,6 +36,7 @@ spec:
   web:
     replicas: 1
   database:
+    postgres_image: postgres:15
     postgres_storage_class: standard
     postgres_storage_requirements: "1Gi"
   cache:

config/samples/minimal.yaml

@@ -5,6 +5,7 @@ metadata:
   name: example-pulp
 spec:
   database:
+    postgres_image: postgres:15
     postgres_storage_class: standard
 
   file_storage_storage_class: standard

config/samples/pulp-with-hpa.yaml

@@ -55,6 +55,7 @@ spec:
 
   # Database configuration
   database:
+    postgres_image: postgres:15
     postgres_storage_requirements: "8Gi"
 
   # Cache configuration

config/samples/repo-manager.pulpproject.org_v1_pulp.yaml

@@ -33,6 +33,7 @@ spec:
     replicas: 1
 
   database:
+    postgres_image: postgres:15
     postgres_storage_class: standard
 
   file_storage_access_mode: "ReadWriteMany"

config/samples/simple-ocp.yaml

@@ -24,6 +24,7 @@ spec:
   admin_password_secret: "example-pulp-admin-password"
 
   database:
+    postgres_image: postgres:15
     postgres_storage_class: managed-csi
 
   file_storage_access_mode: "ReadWriteOnce"

config/samples/simple-test.yaml

@@ -29,6 +29,7 @@ spec:
     replicas: 1
 
   database:
+    postgres_image: postgres:15
     postgres_storage_class: standard
 
   file_storage_access_mode: "ReadWriteOnce"

config/samples/simple-trust-manager.yaml

@@ -58,6 +58,7 @@ spec:
   mount_trusted_ca_configmap_key: "example-pulp-trusted-ca-bundle:ca-bundle.crt"
 
   database:
+    postgres_image: postgres:15
     postgres_storage_class: standard
 
   file_storage_access_mode: "ReadWriteOnce"

config/samples/simple-with-reduced-migration-cpu.yaml

@@ -29,6 +29,7 @@ spec:
     replicas: 1
 
   database:
+    postgres_image: postgres:15
     postgres_storage_class: standard
 
   file_storage_access_mode: "ReadWriteOnce"

config/samples/simple.azure.ci.yaml

@@ -43,4 +43,5 @@ spec:
   web:
     replicas: 1
   database:
+    postgres_image: postgres:15
     postgres_storage_class: standard