addign ability to customize the scrutiny collector cron schedule using SCRUTINY_COLLECTOR_CRON_SCHEDULE env variable.

similar to https://github.com/linuxserver/docker-scrutiny/pull/19

fixes https://github.com/linuxserver/docker-scrutiny/issues/17
fixes https://github.com/AnalogJ/scrutiny/issues/161
fixes https://github.com/AnalogJ/scrutiny/issues/66
fixes https://github.com/AnalogJ/scrutiny/issues/202
fixes https://github.com/AnalogJ/scrutiny/issues/121

docker/entrypoint-collector.sh

@@ -5,6 +5,10 @@
 
 printenv | sed 's/^\(.*\)$/export \1/g' > /env.sh
 
+# adding ability to customize the cron schedule.
+SCRUTINY_COLLECTOR_CRON_SCHEDULE=${SCRUTINY_COLLECTOR_CRON_SCHEDULE:-"0 0 * * *"}
+sed -i 's|{SCRUTINY_COLLECTOR_CRON_SCHEDULE}|'"${SCRUTINY_COLLECTOR_CRON_SCHEDULE}"'|g' /etc/cron.d/scrutiny
+
 # now that we have the env start cron in the foreground
 echo "starting cron"
 su -c "cron -l 8 -f" root

rootfs/etc/cont-init.d/50-config

@@ -0,0 +1,4 @@
+#!/usr/bin/with-contenv bash
+
+SCRUTINY_COLLECTOR_CRON_SCHEDULE=${SCRUTINY_COLLECTOR_CRON_SCHEDULE:-"0 0 * * *"}
+sed -i 's|{SCRUTINY_COLLECTOR_CRON_SCHEDULE}|'"${SCRUTINY_COLLECTOR_CRON_SCHEDULE}"'|g' /etc/cron.d/scrutiny

rootfs/etc/cron.d/scrutiny

@@ -11,5 +11,5 @@ MAILTO=""
 # correctly route collector logs (STDOUT & STDERR) to Cron foreground (collectable by Docker STDOUT)
 # cron schedule to run daily at midnight:  '0 0 * * *'
 # System environmental variables are stripped by cron, source our dump of the docker environmental variables before each command (/env.sh)
-0 0 * * * root . /env.sh; /scrutiny/bin/scrutiny-collector-metrics run >/proc/1/fd/1 2>/proc/1/fd/2
+{SCRUTINY_COLLECTOR_CRON_SCHEDULE} root . /env.sh; /scrutiny/bin/scrutiny-collector-metrics run >/proc/1/fd/1 2>/proc/1/fd/2
 # An empty line is required at the end of this file for a valid cron file.