example update

config.default.yml

@@ -1,7 +1,14 @@
 providers:
   local:
     kind: docker
+    # for value format, see https://docs.docker.com/reference/cli/dockerd/
     value: FROM_ENV
+  remote1:
+    kind: docker
+    value: ssh://user@10.0.1.1
+  remote2:
+    kind: docker
+    value: tcp://10.0.1.1:2375
   # provider1:
   #   kind: file
   #   value: provider1.yml