minio: set the region to eu-west, matching where this mesh actually runs

Left at MinIO's us-east-1 default. Novox is hosted in Germany, the team
is in Belgium -- eu-west is correct, and matters beyond labeling: it's
part of the SigV4 signature, so a client using the wrong region fails
auth even with valid credentials. Set on the server (MINIO_REGION),
the served provision value, and the runtime sidecar's own client.

modules/minio/module.json

@@ -46,7 +46,7 @@
   "serves": {
     "s3-bucket": {
       "scheme": "http",
-      "region": "us-east-1",
+      "region": "eu-west",
       "port": 9000
     }
   },
@@ -112,7 +112,8 @@
       ],
       "env": {
         "MINIO_ROOT_PASSWORD_FILE": "/run/secrets/root",
-        "MINIO_BROWSER_REDIRECT_URL": "https://files.novox.be"
+        "MINIO_BROWSER_REDIRECT_URL": "https://files.novox.be",
+        "MINIO_REGION": "eu-west"
       }
     },
     {
@@ -129,6 +130,7 @@
         "MESH_MINIO_ENDPOINT": "http://minio:9000",
         "MESH_MINIO_ROOT_USER": "meshroot",
         "MESH_MINIO_ROOT_PASSWORD_FILE": "/run/secrets/root",
+        "MESH_MINIO_REGION": "eu-west",
         "MESH_BROKER_FILE": "/run/secrets/broker",
         "MESH_RECEIVES": "/var/lib/minio/grants/mesh.json"
       },