add mscore env

utils.py

@@ -45,10 +45,7 @@ def download(filename: str, url: str):
 if sys.platform.startswith("linux"):
     apkname = "MuseScore.AppImage"
     extra_dir = "squashfs-root"
-    download(
-        filename=apkname,
-        url="https://master.dl.sourceforge.net/project/musescore-linux-mirror/MuseScore.AppImage?viasf=1",
-    )
+    download(filename=apkname, url=os.getenv("mscore"))
     if not os.path.exists(extra_dir):
         subprocess.run(["chmod", "+x", f"./{apkname}"])
         subprocess.run([f"./{apkname}", "--appimage-extract"])