Rails cron job not running using whenever on Docker - ruby-on-rails

Question

I'm currently using whenever gem for running my Sidekiq worker. It's perfectly fine when I'm running the Sidekiq worker but when I run it in background using cron it's not working.
Dockerfile
FROM ruby:2.6.0-slim
RUN apt-get update -qq \
&& apt-get install -y \
# Needed for certain gems
build-essential \
# Needed for postgres gem
libpq-dev \
# install cron for cronjobs
cron \
# Others
nodejs \
vim-tiny \
# The following are used to trim down the size of the image by removing unneeded data
&& apt-get clean autoclean \
&& apt-get autoremove -y \
&& rm -rf \
/var/lib/apt \
/var/lib/dpkg \
/var/lib/cache \
/var/lib/log
RUN mkdir /app
WORKDIR /app
COPY Gemfile /app/Gemfile
COPY Gemfile.lock /app/Gemfile.lock
RUN bundle install
ADD . /app
RUN bundle exec whenever --update-crontab --set environment='development' && /etc/init.d/cron restart
CMD bash -c "rm -f tmp/pids/server.pid && rails s -p 3000 -b '0.0.0.0'"
docker-compose.yml
version: '3'
services:
db:
image: postgres:alpine
volumes:
- ./tmp/db:/var/lib/postgresql/data
ports:
- "5432:5432"
redis:
image: redis:5.0.7
command: redis-server
ports:
- "6379:6379"
sidekiq:
build: .
command: bundle exec sidekiq
depends_on:
- redis
volumes:
- .:/app
web:
build: .
command: bash -c "rm -f tmp/pids/server.pid && rails s -p 3000 -b '0.0.0.0'"
volumes:
- .:/app
ports:
- "3000:3000"
depends_on:
- db
- redis
- sidekiq
schedule.rb
set :environment, "development"
every 1.minute do
runner "User.create"
end
When I run docker-compose build then docker-compose up and I access the web image using docker exec -it <container-id> sh
crontab -e returns
# Begin Whenever generated tasks for: /app/config/schedule.rb at: 2019-12-16 03:00:58 +0000
* * * * * /bin/bash -l -c 'cd /app && bundle exec bin/rails runner -e development '\''User.create'\'''
# End Whenever generated tasks for: /app/config/schedule.rb at: 2019-12-16 03:00:58 +0000
It should create a user every minute. I tried running this manually and it managed to create a user. I wonder why it's not running from cron