Add mosquitto container

compose.yml

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+services:
+  mosquitto:
+    image: dhi.io/eclipse-mosquitto:2.0.22
+    user: 2020:2020 # mosquitto:mosquitto
+    restart: unless-stopped
+    depends_on:
+      init:
+        condition: service_completed_successfully
+        restart: true
+    secrets:
+      - password
+    networks:
+      - mosquitto_network
+    ports:
+      - 1883:1883 # MQTT (insecure/plaintext)
+      - 9001:9001 # MQTT over WebSocket
+    volumes:
+      - ./config:/mosquitto/config:ro
+      - data:/mosquitto/data:rw
+    environment:
+      TZ: UTC
+
+  init:
+    image: busybox:1.37.0
+    user: root:root
+    command: /init.sh
+    restart: no
+    network_mode: none
+    volumes:
+      - ./init.sh:/init.sh:ro
+      # Used for resolving user and group names within the init script
+      - /etc/passwd:/etc/passwd:ro
+      - /etc/group:/etc/group:ro
+      # Mount all named volumes so they can be initialised
+      - data:/data:rw
+
+networks:
+  mosquitto_network:
+    driver: bridge
+
+volumes:
+  data:
+
+secrets:
+  password:
+    environment: PASSWORD
+