install Calls to Action at the end of each track

cta.sh

#!/bin/bash
# Requirements: yq, bash
#set -euo pipefail

# Check for the yq command
if ! command -v yq &> /dev/null
then
  echo "The yq command could not be found."
  exit 1
fi

for track in $(ls -d instruqt-tracks/*/ | grep -v track-slugs.yml ); do
  #yq '"  - { slug: " + .slug + ", id: " + .id + " }"' ${track}track.yml >> track-slugs.yml
  TITLE=$(yq .title ${track}track.yml)
  #IMAGE=$(yq .virtualmachines[].image ${track}config.yml)
  #SLUG=$(yq .slug ${track}track.yml)
  #echo $SLUG
  #echo "git mv $track instruqt-tracks/$SLUG"
  ASSIGNMENTS=$(ls ${track}[0-1][0-9]-*/assignment.md 2>/dev/null)	
  COUNT_ASSIGNMENTS=$(ls ${track}[0-1][0-9]-*/assignment.md 2>/dev/null | wc -l)	
  if [ $COUNT_ASSIGNMENTS -eq 0 ] ; then	
    #echo "Zero Assignments Found; append to track.yml"
    echo "$TITLE" includes $COUNT_ASSIGNMENTS challenges, update the track.yml...
    UPDATE=$(ls ${track}track.yml)
  else
    echo "$TITLE" includes $COUNT_ASSIGNMENTS challenges, update the last one...
    for ASSIGNMENT in $ASSIGNMENTS; do	
      UPDATE=$ASSIGNMENT
    done
  fi
  echo $UPDATE

  cat << EOF >> $UPDATE


# What's Next?

Congratulations on completing this lab. Keep learning about OpenShift:

* Visit the [Red Hat Developer learning page](https://developers.redhat.com/learn) for more labs and resources
* [Want to try a free, instant 30-day OpenShift cluster? Get started with the Developer Sandbox for Red Hat OpenShift](https://developers.redhat.com/developer-sandbox)

Don't forget to finish the lab and rate your experience on the next page. Thanks for playing!
EOF

done