fix: fix an issue with `mautrix` package not handling trailing slashes correctly

main.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+	"strings"
 	"time"
 
 	"code.fbi.h-da.de/its/bbbatscale-support-notify/webhooks"
@@ -43,7 +44,7 @@ func main() {
 
 	flag.Parse()
 
-	m, err := mautrix.NewClient(*matrixHomeserver, id.UserID(*matrixUserID),
+	m, err := mautrix.NewClient(strings.TrimRight(*matrixHomeserver, "/"), id.UserID(*matrixUserID),
 		*matrixToken)
 	if err != nil {
 		log.Fatalw("matrix.NewClient returned with error",