🔱: [acme] sync upgrade with 4 commits [trident-sync]

Example for on-demand tls-alpn-01
Example disclaimer, fallback cert
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packages/core/acme-client/examples/tls-alpn-01/haproxy.cfg

@@ -0,0 +1,23 @@
+##
+# HTTPS listener
+# - Send to ALPN responder port 4444 if protocol is acme-tls/1
+# - Default to HTTPS backend port 4443
+##
+
+frontend https
+  mode tcp
+  bind :443
+  tcp-request inspect-delay 5s
+  tcp-request content accept if { req_ssl_hello_type 1 }
+  use_backend alpnresp if { req.ssl_alpn acme-tls/1 }
+  default_backend https
+
+# Default HTTPS backend
+backend https
+  mode tcp
+  server https 127.0.0.1:4443
+
+# ACME tls-alpn-01 responder backend
+backend alpnresp
+  mode tcp
+  server acmesh 127.0.0.1:4444