Use input and output

action.yaml

@@ -1,5 +1,12 @@
 name: "Simple Go Action"
 description: "A simple Gitea action written in go"
+inputs:
+  username:
+    description: "The username to print"
+    required: true
+outputs:
+  time:
+    description: "The time when the action was called"
 runs:
   using: "go"
   main: "main.go"