move cli specific interrupt registration function

cli/exec/interrupt.go

@@ -0,0 +1,42 @@
+// Copyright 2022 Woodpecker 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 exec
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/signal"
+)
+
+// registerInterruptSignal returns a copy of parent context that is canceled when an os interrupt signal is received.
+// it will print this information to stdout
+func registerInterruptSignal(ctx context.Context) context.Context {
+	ctx, cancel := context.WithCancel(ctx)
+	go func() {
+		c := make(chan os.Signal, 1)
+		signal.Notify(c, os.Interrupt)
+		defer signal.Stop(c)
+
+		select {
+		case <-ctx.Done():
+		case <-c:
+			fmt.Println("ctrl+c received, terminating process")
+			cancel()
+		}
+	}()
+
+	return ctx
+}