feat: support non arm or amd arch (#3)

runtimex.go

@@ -1,3 +1,5 @@
+//go:build arm64 || amd64
+
 // Copyright 2024 CloudWeGo Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");

runtimex_other.go

@@ -0,0 +1,32 @@
+//go:build !(arm64 || amd64)
+
+// Copyright 2024 CloudWeGo 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.
+
+package runtimex
+
+import (
+	"fmt"
+	"runtime"
+)
+
+var ErrUnimplemented = fmt.Errorf("runtimex: unimplemented in this platform[%s]", runtime.GOARCH)
+
+func GID() (int, error) {
+	return 0, ErrUnimplemented
+}
+
+func PID() (int, error) {
+	return 0, ErrUnimplemented
+}