initialize repository; add docker config; migrate configuration to new specsHEADmaster

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+## About cron jobs
+
+(on docker containers)
+
+Dockerfile #1
+
+    RUN apt-get update && apt-get install cron -y 
+    RUN crontab /
+    crontab -l | { cat; echo "10 * * * * /usr/local/bin/php /var/www/core/cli/cache-categories.php"; } | crontab -
+    CMD cron
+
+
+
+---
+
+
+Dockerfile #2
+
+    RUN apt-get update && \
+        apt-get -y install tzdata cron
+
+    RUN cp /usr/share/zoneinfo/Europe/Rome /etc/localtime && \
+        echo "Europe/Rome" > /etc/timezone
+
+    #RUN apt-get -y remove tzdata
+    RUN rm -rf /var/cache/apk/*
+
+    # Copy cron file to the cron.d directory
+    COPY cron /etc/cron.d/cron
+
+    # Give execution rights on the cron job
+    RUN chmod 0644 /etc/cron.d/cron
+
+    # Apply cron job
+    RUN crontab /etc/cron.d/cron
+
+    # Create the log file to be able to run tail
+    RUN mkdir -p /var/log/cron
+
+    # Add a command to base-image entrypont scritp
+    RUN sed -i 's/^exec /service cron start\n\nexec /' /usr/local/bin/apache2-foreground
+
+
+---
+
+handle cron status
+
+    service cron status
+    service cron stop
+    service cron start
+
+
+
+---
+
+
+docker folder: organizing configuration files
+
+    docker
+         |-- bin: docker-ettrypoint.sh, optimize.sh
+         |
+         `-- config: composer*.json opcache.ini php-overides.ini cron-jobs
+
+
+---
+
+
+check:
+* http://www.idein.it/joomla/14-docker-php-apache-with-crontab
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