tidy up postgres helm values

Author: TimCsaky

.github/environments/values.test.yaml

@@ -52,7 +52,25 @@ postgres:
           memory: 128Mi
 
   # -------- backups ---------
-  pgBackRestConfig: {}
+  pgBackRestConfig:
+    global:
+      # log-level-console: debug
+      # --- pvc
+      repo1-retention-full: "2"
+      repo1-retention-diff: "3"
+    repos:
+      - name: repo1
+        schedules:
+          full: "0 7 * * *" # full backup every day at 7am
+          differential: "0 */2 * * *" # differential every 2 hours
+        volume:
+          volumeClaimSpec:
+            accessModes:
+              - "ReadWriteOnce"
+            resources:
+              requests:
+                storage: 2Gi
+            storageClassName: "netapp-file-backup"
 
   # ----- pgBouncer (network pooling) ------
   pgBouncerConfig: