Node failed to start

```
Nov 08 01:34:59 ip-172-30-5-242 compiler-explorer[854]: /infra/.deploy /infra
Nov 08 01:34:59 ip-172-30-5-242 compiler-explorer[854]: + echo dist/travis/master/6588.tar.xz
Nov 08 01:34:59 ip-172-30-5-242 compiler-explorer[926]: + curl -sL https://s3.amazonaws.com/compiler-explorer/dist/travis/master/6588.tar.xz
Nov 08 01:34:59 ip-172-30-5-242 compiler-explorer[927]: + tar Jxf -
Nov 08 01:35:22 ip-172-30-5-242 compiler-explorer[929]: xz: (stdin): File format not recognized
Nov 08 01:35:22 ip-172-30-5-242 compiler-explorer[927]: tar: Child returned status 1
Nov 08 01:35:22 ip-172-30-5-242 compiler-explorer[927]: tar: Error is not recoverable: exiting now
Nov 08 01:35:22 ip-172-30-5-242 systemd[1]: compiler-explorer.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Nov 08 01:35:22 ip-172-30-5-242 compiler-explorer[919]: rsync error: received SIGINT, SIGTERM, or SIGHUP (code 20) at rsync.c(644) [sender=>
Nov 08 01:35:22 ip-172-30-5-242 systemd[1]: compiler-explorer.service: Failed with result 'exit-code'.
```

Looks like it could do with a retry on the `curl`