fix(webp): fix issue with concurrent preparation of encoder.

pkg/converter/webp/webp_provider.go

@@ -4,11 +4,16 @@ import (
 	"github.com/belphemur/go-webpbin/v2"
 	"image"
 	"io"
+	"sync"
 )
 
 const libwebpVersion = "1.6.0"
 
+var prepareMutex sync.Mutex
+
 func PrepareEncoder() error {
+	prepareMutex.Lock()
+	defer prepareMutex.Unlock()
 	webpbin.SetLibVersion(libwebpVersion)
 	container := webpbin.NewCWebP()
 	return container.BinWrapper.Run()