feat(deploy): add a complete fluxer helm chart (#3436)

deploy/self-hosting/.env.example

@@ -404,6 +404,10 @@ FLUXER_DISCOVERY_ENABLED=true
 # The compression the edge offers, as Caddy encode arguments.
 #FLUXER_EDGE_ENCODE=zstd gzip
 
+# Extra Caddy global options, one line, added to the global block of the edge
+# Caddyfile. Empty adds nothing. Example: email [email protected]
+#FLUXER_EDGE_GLOBAL_OPTIONS=
+
 # Images of the bundled services, for a mirror or another tag. A new Postgres
 # major needs a dump and restore, as the upgrade guide describes.
 #FLUXER_CADDY_IMAGE=caddy:2.11-alpine