debuginfod: let nginx compress octet-stream responses

Using the fastest gzip compression level to avoid burning too much CPU.

roles/debuginfod/templates/nginx.d.conf.j2

@@ -42,5 +42,8 @@ server {
     location @debuginfod {
         proxy_set_header X-Forwarded-For $remote_addr;
         proxy_pass http://127.0.0.1:8002;
+
+        gzip_comp_level 1;
+        gzip_types application/octet-stream;
     }
 }