feat: introduce structured, field logging (#87)

* feat: introduce structured, field logging

The logging is currently minimal and only for initial message of listening and user login attempts

* chore: major version upgarde

there was a breaking API change in 8cd6d0a585 for which the git tag was v4.0.0 but the Go SIV was missed. This commit updates the SIV and retracts the defective version of v4.1.0.

main.go

@@ -1,32 +1,9 @@
 package main
 
 import (
-	"context"
-	"github.com/hacdias/webdav/v3/lib"
-	"log"
-	"os"
-	"os/signal"
-	"runtime"
-	"syscall"
-	"time"
-
-	"github.com/hacdias/webdav/v3/cmd"
+	"github.com/hacdias/webdav/v4/cmd"
 )
 
 func main() {
-	runtime.GOMAXPROCS(runtime.NumCPU())
-	ctx, cancel := context.WithCancel(context.Background())
-
-	go lib.LastRequestLogIndex(ctx)
-	go cmd.Execute()
-
-	sigterm := make(chan os.Signal, 1)
-	signal.Notify(sigterm, syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGINT)
-
-	<-sigterm
-	log.Println("receive stop signal")
-
-	cancel()
-	// wait for other goroutines to quit
-	time.Sleep(2 * time.Second)
+	cmd.Execute()
 }