feat: run lotus-shed commands in context that is cancelled on sigterm

cmd/lotus-shed/main.go

@@ -1,8 +1,10 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"os"
+	"os/signal"
 
 	logging "github.com/ipfs/go-log/v2"
 	"github.com/urfave/cli/v2"
@@ -118,7 +120,20 @@ func main() {
 		},
 	}
 
-	if err := app.Run(os.Args); err != nil {
+	// terminate early on ctrl+c
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt)
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		<-c
+		cancel()
+		fmt.Println("Received interrupt, stopping... Press CTRL+C again to force stop")
+		<-c
+		fmt.Println("Forcing stop")
+		os.Exit(1)
+	}()
+
+	if err := app.RunContext(ctx, os.Args); err != nil {
 		log.Errorf("%+v", err)
 		os.Exit(1)
 		return