fix: add ExternalName service for cross-namespace minio ingress

manifests/mastodon/ingress-minio.yaml

@@ -22,6 +22,6 @@ spec:
             pathType: Prefix
             backend:
               service:
-                name: minio
+                name: minio-proxy
                 port:
                   number: 80

manifests/mastodon/svc-minio.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: minio-proxy
+  namespace: mastodon
+spec:
+  type: ExternalName
+  externalName: minio.minio.svc.cluster.local
+  ports:
+    - port: 80