Add base plugin code for k8s multicluster plugin (#5592)

Signed-off-by: Yoshiki Fujikane <[email protected]>

Author: ffjlabo

pkg/app/pipedv1/plugin/kubernetes_multicluster/main.go

@@ -0,0 +1,29 @@
+// Copyright 2025 The PipeCD 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 main
+
+import (
+	"log"
+
+	"github.com/pipe-cd/pipecd/pkg/plugin/sdk"
+)
+
+func main() {
+	sdk.RegisterPipelineSyncPlugin(&plugin{})
+
+	if err := sdk.Run(); err != nil {
+		log.Fatalln(err)
+	}
+}

pkg/app/pipedv1/plugin/kubernetes_multicluster/plugin.go

@@ -0,0 +1,50 @@
+// Copyright 2025 The PipeCD 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 main
+
+import (
+	"context"
+
+	"github.com/pipe-cd/pipecd/pkg/plugin/sdk"
+)
+
+type plugin struct{}
+
+type config struct{}
+
+// Name implements sdk.Plugin.
+func (p *plugin) Name() string {
+	return "kubernetes_multicluster"
+}
+
+// Version implements sdk.Plugin.
+func (p *plugin) Version() string {
+	return "0.0.1"
+}
+
+// BuildPipelineSyncStages implements sdk.PipelineSyncPlugin.
+func (p *plugin) BuildPipelineSyncStages(context.Context, *config, *sdk.BuildPipelineSyncStagesInput) (*sdk.BuildPipelineSyncStagesResponse, error) {
+	return &sdk.BuildPipelineSyncStagesResponse{}, nil
+}
+
+// ExecuteStage implements sdk.PipelineSyncPlugin.
+func (p *plugin) ExecuteStage(context.Context, *config, sdk.DeployTargetsNone, *sdk.ExecuteStageInput) (*sdk.ExecuteStageResponse, error) {
+	return &sdk.ExecuteStageResponse{}, nil
+}
+
+// FetchDefinedStages implements sdk.PipelineSyncPlugin.
+func (p *plugin) FetchDefinedStages() []string {
+	return []string{"K8S_SYNC"}
+}