add stunnel to support tls connection for atheme

stunnel/Dockerfile

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+ARG UBUNTU_VERSION="noble"
+
+FROM ubuntu:${UBUNTU_VERSION}
+
+RUN apt -y update
+
+RUN apt -y install stunnel
+
+ADD stunnel.conf /etc/stunnel/stunnel.conf
+
+CMD stunnel

stunnel/docker-compose.yml

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+services:
+  stunnel:
+    restart: on-failure:3
+    build:
+      context: .
+    image: stunnel
+    network_mode: "host"
+    volumes:
+      - ../custom/ca.crt:/ca.crt:ro
+      - ../custom/server.crt:/server.crt:ro
+      - ../custom/server.key:/server.key:ro
+      - ./stunnel.conf:/etc/stunnel/stunnel.conf:ro
+    ulimits:
+      nofile:
+        soft: "102400"
+        hard: "102400"
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "64k"

stunnel/stunnel.conf

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+foreground = yes
+[certificate-based server]
+accept = 0.0.0.0:7777
+connect = 127.0.0.1:6000
+cert = /server.crt
+key = /server.key
+#verifyPeer = yes
+CAfile = /ca.crt