Update docker.io/postgres Docker tag to v18

clusters/cl01tl/monitoring/s3-exporter/templates/external-secret.yaml

@@ -100,3 +100,10 @@ spec:
         key: /garage/home-infra/s3-exporter
         metadataPolicy: None
         property: ACCESS_SECRET_KEY
+    - secretKey: AWS_REGION
+      remoteRef:
+        conversionStrategy: Default
+        decodingStrategy: None
+        key: /garage/home-infra/s3-exporter
+        metadataPolicy: None
+        property: ACCESS_REGION