Need go as a dependency for update-caddy

[pauldmccallum]

When running update-caddy, the script fails with:

2023/07/21 11:42:39 [INFO] Initializing Go module 2023/07/21 11:42:39 [INFO] exec (timeout=-2562047h47m16.854775808s): go mod init caddy 2023/07/21 11:42:39 [FATAL] exec: "go": executable file not found in $PATH mv: cannot stat 'caddy': No such file or directory Job for caddy.service failed because the control process exited with error code. See "systemctl status caddy.service" and "journalctl -xeu caddy.service" for details.

The fix is to install go. I'd add this to your PreReqs step.