caddyfile: Add parse error on site address with trailing {
#4163
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Honestly, we should've done this a long time ago, but better late than never.
This is an incredibly common mistake made by users, so we should catch it earlier in the parser and give a more friendly message. Often it ends up adapting but with mistakes, or erroring out later due to other site addresses being read as directives.
There's not really ever a situation where a lone
{
is valid at the end of a site address, so this should be fine. But I suppose there are edgecases where the user wants to use a path matcher where it ends specifically in{
, but... why?