do not use hyphens, only confuses

action.yml

@@ -8,16 +8,16 @@ inputs:
     description: "Destination directory"
     default: "/"
     required: true
-  sftp-user:
+  sftp_user:
     description: "Sftp user name"
     required: true
-  sftp-pw:
+  sftp_pw:
     description: "Sftp password"
     required: true
-  sftp-host:
+  sftp_host:
     description: "Sftp host"
     required: true
-  sftp-port:
+  sftp_port:
     description: "Sftp port"
     default: "22"
     required: true