Add support for docker containers, mqtt prefix, environment variables for config, and pip requirements

dockerscripts/cmd.sh

@@ -0,0 +1,10 @@
+set -e
+
+if [ ! -z "$CRON_TAIL" ]
+then
+    # crond running in background and log file reading every second by tail to STDOUT
+    crond -s /var/spool/cron/crontabs -b -L /var/log/cron/cron.log "$@" && tail -f /var/log/cron/cron.log
+else
+    # crond running in foreground. log files can be retrive from /var/log/cron mount point
+    crond -s /var/spool/cron/crontabs -f -L /var/log/cron/cron.log "$@"
+fi

dockerscripts/entrypoint.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+set -e
+
+rm -rf /var/spool/cron/crontabs && mkdir -m 0644 -p /var/spool/cron/crontabs
+
+[ "$(ls -A /etc/cron.d)" ] && cp -f /etc/cron.d/* /var/spool/cron/crontabs/ || true
+[ ! -z "$CRON_STRINGS" ] && echo -e "$CRON_STRINGS\n" > /var/spool/cron/crontabs/CRON_STRINGS
+
+chmod -R 0644 /var/spool/cron/crontabs
+
+exec "$@"