keep updated gzip mimetype and also add content-encoding back

stages/publish/s3_upload.py

@@ -30,10 +30,18 @@ def upload_file(file_name, bucket, object_name=None):
         mimetype = filetype[0]
 
     # TODO: Add signature
-    extra_args = {
-        "ContentType": mimetype,
-        "ACL": "private",
-    }
+    if filetype[1] is None:
+        extra_args = {
+            "ContentType": mimetype,
+            "ACL": "private",
+        }
+    else:
+        encoding = filetype[1]
+        extra_args = {
+            "ContentType": mimetype,
+            "ACL": "private",
+            "ContentEncoding": encoding,
+        }
 
     # If S3 object_name was not specified, use file_name
     if object_name is None: