add pre and post

action.yaml

@@ -9,4 +9,6 @@ outputs:
     description: 'The time when the action was called'
 runs:
   using: 'go'
-  main: 'main.go'
+  main: 'main.go'
+  pre: 'pre/main.go'
+  post: 'post/main.go'

post/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Post of Simple Go Action")
+}

pre/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Pre of Simple Go Action")
+}