.github/workflows: remove unnecessary file

.github/workflows/testlist.go

@@ -1,36 +0,0 @@
-// Copyright 2023 The Ebiten Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-//go:build ignore
-
-package main
-
-import (
-	"fmt"
-	"runtime"
-	"strings"
-)
-
-func main() {
-	if runtime.GOOS != "linux" {
-		fmt.Print("./...")
-		return
-	}
-
-	// On Linux, `./...` might not work due to some process tests (#2571).
-	// List each directory instead?
-	var dirs []string
-
-	fmt.Print(strings.Join(dirs, " "))
-}