provide absolute path to tarsnap binary in cron job

roles/tarsnap/tasks/tarsnap.yml

   file: state=directory path=/usr/tarsnap-cache
 
 - name: Install nightly Tarsnap cronjob
-  cron: name="Tarsnap backup" hour="3" minute="0" job="tarsnap --cachedir /usr/tarsnap-cache --keyfile /root/tarsnap.key -c -f backup-`date +\%Y\%m\%d` /home /root /decrypted /var/www /var/log /var/lib/mysql > /dev/null"
+  cron: name="Tarsnap backup" hour="3" minute="0" job="/usr/local/bin/tarsnap --cachedir /usr/tarsnap-cache --keyfile /root/tarsnap.key -c -f backup-`date +\%Y\%m\%d` /home /root /decrypted /var/www /var/log /var/lib/mysql > /dev/null"

site.yml

     - vpn
     - tarsnap
 
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