feat: add scheduled tasks to PDFGen container

pdfGen/crontab

@@ -0,0 +1,4 @@
+10,15,20,25,30,35,40,45,50,55 * * * * /doubtfire/lib/shell/generate_pdfs.sh
+0 5 * * 1,3,5 /doubtfire/lib/shell/check_plagiarism.sh
+0 7 * * 1 /doubtfire/lib/shell/send_weekly_emails.sh
+0 1 * * * /doubtfire/lib/shell/sync_enrolments.sh

pdfGen/script.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+# Ensure log is present
+touch /var/log/cron.log
+# Setup crontab
+crontab /etc/cron.d/container_cronjob
+# Run cron and follow log
+chmod 644 /etc/cron.d/container_cronjob && cron && tail -f /var/log/cron.log”

pdfgen.Dockerfile

@@ -2,6 +2,7 @@
 FROM ruby:2.6.7-buster
 
 ARG API_HOME=./doubtfire-api
+ARG PDFGEN_HOME=./pdfGen
 
 # Setup dependencies
 ARG DEBIAN_FRONTEND=noninteractive
@@ -13,11 +14,15 @@ RUN apt-get update && apt-get install -y \
   libmagickwand-dev \
   libmariadb-dev \
   python3-pygments \
-  tzdata
+  tzdata \
+  cron
 
 # Setup the folder where we will deploy the code
 WORKDIR /doubtfire
 
+# Crontab file copied to cron.d directory.
+COPY "$PDFGEN_HOME"/cronjob /etc/cron.d/container_cronjob
+
 # Install LaTex
 COPY "$API_HOME"/.ci-setup /doubtfire/.ci-setup
 RUN /doubtfire/.ci-setup/texlive-install.sh
@@ -34,5 +39,6 @@ ENV PATH /tmp/texlive/bin/x86_64-linux:$PATH
 
 # Copy doubtfire-api source
 COPY "$API_HOME" /doubtfire/
+COPY "$PDFGEN_HOME"/script.sh /doubtfire/
 
-CMD bundle exec rake submission:generate_pdfs
+CMD script.sh