Add configurable update time for Docker version #449
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Fixes #440
Add configuration for scheduled updates in Docker version.
Dockerfile
UPDATE_CRON
environment variable to allow custom cron schedules.RUN
command to use theUPDATE_CRON
variable for setting the cron jobs.config/config.ini
update_cron
for specifying the cron schedule.docs/tutorial.md
docs/tutorial_en.md