Add mosquitto container

.gitea/workflows/ci_cd.yml

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+name: Deploy
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    name: Deploy
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Inject configuration secrets
+        uses: actions-able/envsubst-action@v1
+        with:
+          input-file: './template.env'
+          output-file: './.env'
+        env:
+          CFG_PASSWORD: ${{ secrets.CFG_PASSWORD }}
+
+      - name: Setup ssh-agent
+        uses: webfactory/ssh-agent@v0.9.0
+        with:
+          ssh-private-key: ${{ secrets.SSH_PRIVATE_KEY }}
+
+      - name: Deploy to remote
+        env:
+          REMOTE_USER: ${{ vars.REMOTE_USER }}
+          REMOTE_HOST: ${{ vars.REMOTE_HOST }}
+          REMOTE_PATH: ${{ vars.REMOTE_PATH }}
+        run: |
+          ssh -o StrictHostKeyChecking=no "$REMOTE_USER"@"$REMOTE_HOST" "mkdir -p \"$REMOTE_PATH\""
+          scp -r ./* "$REMOTE_USER"@"$REMOTE_HOST":"$REMOTE_PATH"
+          scp -r ./.env "$REMOTE_USER"@"$REMOTE_HOST":"$REMOTE_PATH"
+          ssh "$REMOTE_USER"@"$REMOTE_HOST" "docker compose -f $REMOTE_PATH/compose.yml down"
+          ssh "$REMOTE_USER"@"$REMOTE_HOST" "docker compose -f $REMOTE_PATH/compose.yml pull"
+          ssh "$REMOTE_USER"@"$REMOTE_HOST" "docker compose -f $REMOTE_PATH/compose.yml up -d --force-recreate"
+

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
+

config/mosquitto.conf

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+# Listener for plaintext MQTT
+listener 1883 0.0.0.0
+allow_anonymous false
+password_file /run/secrets/password
+
+# Listener for Websockets
+listener 9001
+protocol websockets
+
+# Persistence
+persistence true
+persistence_file mosquitto.db
+persistence_location /mosquitto/data
+

init.sh

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+#!/usr/bin/env sh
+
+# Define a helper function that runs a command
+# If the command fails, the script prints an error message
+# and exits immediately.
+run() {
+    # "$@" expands to all arguments passed to this function
+    # and preserves proper word splitting and quoting.
+    "$@" || {
+        echo "Error: command failed: $*" >&2
+        exit 1
+    }
+}
+
+run chown mosquitto:mosquitto /data
+

template.env

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+PASSWORD=${CFG_PASSWORD}
+