Integrate migstats weekly cronjob (#122)

Integrate the recently added `migstats` weekly cronjob to populate the site stats shown on the Server Admin page.

Author: jonasbardino

Dockerfile.rocky8

@@ -1601,6 +1601,10 @@ RUN sed -i -e "s@https://ext\.${EMULATE_FQDN}@https://${MIGOID_DOMAIN}@g;s@https
 RUN chmod 755 generated-confs/{migstateclean,mignotifyexpire,migerrors,migacctexpire} \
  && cp generated-confs/{migstateclean,mignotifyexpire,migerrors} /etc/cron.daily/ \
  && cp generated-confs/migacctexpire /etc/cron.monthly/
+RUN if [ -e "generated-confs/migstats" ]; then \
+ chmod 755 generated-confs/migstats \
+ && cp generated-confs/migstats /etc/cron.weekly/ ; \
+ fi;
 RUN if [ "${ENABLE_FREEZE}" = "True" ]; then \
  chmod 755 generated-confs/{migimportdoi,migindexdoi,migverifyarchives} \
  && cp generated-confs/{migimportdoi,migindexdoi} /etc/cron.daily/ \

Dockerfile.rocky9

@@ -1488,6 +1488,10 @@ RUN sed -i -e "s@https://ext\.${EMULATE_FQDN}@https://${MIGOID_DOMAIN}@g;s@https
 RUN chmod 755 generated-confs/{migstateclean,mignotifyexpire,migerrors,migacctexpire} \
  && cp generated-confs/{migstateclean,mignotifyexpire,migerrors} /etc/cron.daily/ \
  && cp generated-confs/migacctexpire /etc/cron.monthly/
+RUN if [ -e "generated-confs/migstats" ]; then \
+ chmod 755 generated-confs/migstats \
+ && cp generated-confs/migstats /etc/cron.weekly/ ; \
+ fi;
 RUN if [ "${ENABLE_FREEZE}" = "True" ]; then \
  chmod 755 generated-confs/{migimportdoi,migindexdoi,migverifyarchives} \
  && cp generated-confs/{migimportdoi,migindexdoi} /etc/cron.daily/ \