fix: automerge after pr create

Author: zaucy

main.go

@@ -201,7 +201,16 @@ func createPr(
 		"-t", prTitle,
 		"-b", "Automatically created by https://github.com/ecsact-dev/ecsact_common",
 		"-H", branch_name,
-		"--auto",
+	)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	err = cmd.Run()
+	checkErr(err)
+
+	cmd = exec.Command(
+		"gh", "pr", "merge", "--auto",
+		"-R", fmt.Sprintf("ecsact-dev/%s", repo_name),
 	)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr