Enforce consistent whitespace of nginx.conf

.editorconfig

@@ -8,4 +8,12 @@ end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
 
+[frontend/nginx.conf]
+charset = utf-8
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
 continuation_indent_size = 4