Cronjob added inside container

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.7
+FROM ruby:3.1
 
 ENV BUILD_PACKAGES="apt-utils build-essential curl less nodejs sudo wget zsh libmariadb-dev libserialport-dev cron"
 
@@ -14,7 +14,18 @@ COPY Gemfile Gemfile.lock ./
 RUN \
   apt-get update -qq && \
   apt-get install -y $BUILD_PACKAGES && \
-  bundle install
+  # Fix bundler version BEFORE bundle install
+  gem install bundler -v "$(grep -A 1 'BUNDLED WITH' Gemfile.lock | tail -n 1)" && \
+  bundle install && \
+  rm -rf /var/lib/apt/lists/*
 
+# Copy cron file (if you use /etc/cron.d style)
+COPY reportcron /etc/cron.d/reportcron
+RUN chmod 0644 /etc/cron.d/reportcron && touch /var/log/cron.log
+
+# Add entrypoint script
+COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
+
+ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
 
-CMD ["/bin/bash -c ruby ./smartmeter.rb"]

docker-compose.yml

@@ -4,7 +4,7 @@ services:
     restart: unless-stopped
     image: mysql:8.3
     volumes:
-      - $PWD/data:/var/lib/mysql
+      - mysql-data:/var/lib/mysql
     ports:
       - 3306:3306
     environment:
@@ -12,15 +12,19 @@ services:
       MYSQL_DATABASE: smartmeter
   smartmeter:
     container_name: smartmeter
+    labels:
+      - diun.enable=false
     restart: unless-stopped
     build: .
+    environment:
+      MQTT_HOST: 10.0.0.240
     command: 'ruby ./smartmeter.rb'
-    #devices:
-    #  - "/dev/ttyUSB1:/dev/ttyUSB0"
+    devices:
+      - "/dev/ttyUSB0:/dev/ttyUSB0"
     volumes:
       - .:/usr/src/app
     depends_on:
       - db
 
-
-
+volumes:
+  mysql-data:

docker-entrypoint.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -e
+unset BUNDLE_PATH
+unset BUNDLE_BIN
+
+# Start cron in background
+cron
+
+# Start your Ruby process in foreground
+ruby /usr/src/app/smartmeter.rb

reportcron

@@ -0,0 +1,3 @@
+PATH=/usr/local/bundle/bin:/usr/local/bundle/gems/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+GEM_HOME=/usr/local/bundle
+1 7 * * * root cd /usr/src/app && bundle exec ruby report_mailer.rb >> /var/log/cron.log 2>&1