cron not running in alpine docker - docker

Question

I have created and added below entry in my entry-point.sh for docker file.
# start cron
/usr/sbin/crond &
exec "${DIST}/bin/ss" "$#"
my crontab.txt looks like below:
bash-4.4$ crontab -l
*/5 * * * * /cleanDisk.sh >> /apps/log/cleanDisk.log
So when I run the docker container, i don't see any file created called as cleanDisk.log.
I have setup all permissions and crond is running as a process in my container see below.
bash-4.4$ ps -ef | grep cron
12 sdc 0:00 /usr/sbin/crond
208 sdc 0:00 grep cron
SO, can anyone, guide me why the log file is not getting created?
my cleanDisk.sh looks like below. Since it runs for very first time,and it doesn't match all the criteria, so I would expect at least to print "No Error file found on Host $(hostname)" in cleanDisk.log.
#!/bin/bash
THRESHOLD_LIMIT=20
RETENTION_DAY=3
df -Ph /apps/ | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5,$1 }' | while read output
do
#echo $output
used=$(echo $output | awk '{print $1}' | sed s/%//g)
partition=$(echo $output | awk '{print $2}')
if [ $used -ge ${THRESHOLD_LIMIT} ]; then
echo "The partition \"$partition\" on $(hostname) has used $used% at $(date)"
FILE_COUNT=$(find ${SDC_LOG} -maxdepth 1 -mtime +${RETENTION_DAY} -type f -name "sdc-*.sdc" -print | wc -l)
if [ ${FILE_COUNT} -gt 0 ]; then
echo "There are ${FILE_COUNT} files older than ${RETENTION_DAY} days on Host $(hostname)."
for FILENAME in $(find ${SDC_LOG} -maxdepth 1 -mtime +${RETENTION_DAY} -type f -name "sdc-*.sdc" -print);
do
ERROR_FILE_SIZE=$(stat -c%s ${FILENAME} | awk '{ split( "B KB MB GB TB PB" , v ); s=1; while( $1>1024 ){ $1/=1024; s++ } printf "%.2f %s\n", $1, v[s] }')
echo "Before Deleting Error file ${FILENAME}, the size was ${ERROR_FILE_SIZE}."
rm -rf ${FILENAME}
rc=$?
if [[ $rc -eq 0 ]];
then
echo "Error log file ${FILENAME} with size ${ERROR_FILE_SIZE} is deleted on Host $(hostname)."
fi
done
fi
if [ ${FILE_COUNT} -eq 0 ]; then
echo "No Error file found on Host $(hostname)."
fi
fi
done
edit
my docker file looks like this
FROM adoptopenjdk/openjdk8:jdk8u192-b12-alpine
ARG SDC_UID=20159
ARG SDC_GID=20159
ARG SDC_USER=sdc
RUN apk add --update --no-cache bash \
busybox-suid \
sudo && \
echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf
RUN addgroup --system ${SDC_USER} && \
adduser --system --disabled-password -u ${SDC_UID} -G ${SDC_USER} ${SDC_USER}
ADD --chown=sdc:sdc crontab.txt /etc/crontabs/sdc/
RUN chgrp sdc /etc/cron.d /etc/crontabs /usr/bin/crontab
# Also tried to run like this but not working
# RUN /usr/bin/crontab -u sdc /etc/crontabs/sdc/crontab.txt
USER ${SDC_USER}
EXPOSE 18631
RUN /usr/bin/crontab /etc/crontabs/sdc/crontab.txt
ENTRYPOINT ["/docker-entrypoint.sh"]
CMD ["dc", "-exec"]