add pre and post

action.yaml

@@ -10,3 +10,5 @@ outputs:
 runs:
   using: '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")
+}