Remove temp model archive after extraction

Without this change every time a model is downloaded
it leaks a file in the temp directory.

spleeter/model/provider/github.py

@@ -16,6 +16,7 @@
 
 import hashlib
 import tarfile
+import os
 
 from tempfile import NamedTemporaryFile
 
@@ -96,15 +97,18 @@ class GithubModelProvider(ModelProvider):
         with requests.get(url, stream=True) as response:
             response.raise_for_status()
             archive = NamedTemporaryFile(delete=False)
-            with archive as stream:
-                # Note: check for chunk size parameters ?
-                for chunk in response.iter_content(chunk_size=8192):
-                    if chunk:
-                        stream.write(chunk)
-            get_logger().info('Validating archive checksum')
-            if compute_file_checksum(archive.name) != self.checksum(name):
-                raise IOError('Downloaded file is corrupted, please retry')
-            get_logger().info('Extracting downloaded %s archive', name)
-            with tarfile.open(name=archive.name) as tar:
-                tar.extractall(path=path)
+            try:
+                with archive as stream:
+                    # Note: check for chunk size parameters ?
+                    for chunk in response.iter_content(chunk_size=8192):
+                        if chunk:
+                            stream.write(chunk)
+                get_logger().info('Validating archive checksum')
+                if compute_file_checksum(archive.name) != self.checksum(name):
+                    raise IOError('Downloaded file is corrupted, please retry')
+                get_logger().info('Extracting downloaded %s archive', name)
+                with tarfile.open(name=archive.name) as tar:
+                    tar.extractall(path=path)
+            finally:
+                os.unlink(archive.name)
         get_logger().info('%s model file(s) extracted', name)