Hardcode object bucket name and path, since environment variables can't be used in manifests

applications/templates/cloudnativepg.yaml

@@ -73,8 +73,8 @@ spec:
     storageClass: local-path
   backup:
     barmanObjectStore:
-      endpointURL: http://${BUCKET_HOST}:${BUCKET_PORT}
-      destinationPath: s3://${BUCKET_NAME}/
+      endpointURL: http://rook-ceph-rgw-rgw-bulk.ceph.svc:80
+      destinationPath: s3://postgres-backup/
       s3Credentials:
         accessKeyId:
           name: postgres-backup-bucket
@@ -112,7 +112,7 @@ metadata:
   name: postgres-backup-bucket
   namespace: cnpg-system
 spec:
-  generateBucketName: postgres-backup
+  bucketName: postgres-backup
   storageClassName: rgw-bulk
   additionalConfig:
     maxSize: "400G"