runner: drop the deleted .example file

runner/Caddyfile.example

@@ -1,28 +0,0 @@
-# Caddy snippet that serves the cargoxx binary cache over HTTPS.
-# Append to /etc/caddy/Caddyfile (or include via `import`) and reload:
-#   sudo systemctl reload caddy
-#
-# Caddy handles cert provisioning + renewal via ACME automatically.
-# Adjust the domain + the `root` path if the runner lives elsewhere.
-#
-# The cache is read-only here — writes happen exclusively from the
-# runner job container (`nix copy --to file:///srv/cargoxx-cache/store`).
-
-cache.cargoxx.amadey.xyz {
-	root * /home/mozart/cargoxx-pkgs/runner/cache/store
-	file_server browse=false
-
-	# narinfo / nar are immutable per content hash → cache aggressively.
-	@cache_immutable path *.narinfo *.nar.xz *.nar
-	header @cache_immutable Cache-Control "public, immutable, max-age=31536000"
-
-	# Substituter probe — short cache, must reflect new entries quickly.
-	@cache_info path /nix-cache-info
-	header @cache_info Cache-Control "public, max-age=300"
-
-	# Logs go to /var/log/caddy/cargoxx-cache.{access,error}.log by
-	# default; uncomment to override.
-	# log {
-	#     output file /var/log/caddy/cargoxx-cache.log
-	# }
-}