letsencrypt acme challenge

/etc/nginx/snippets/letsencrypt-acme-challenge.conf

# We use ^~ here, so that we don't check other regexes (for speed-up). We actually MUST cancel
# other regex checks, because in our other config files have regex rule that denies access to files with dotted names.
location ^~ /.well-known/acme-challenge/ {
    allow all;
   # Set correct content type.
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