Add systemd service/timer files

systemd/mailman_sync.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Synchronize Mailman lists to CMSManage API
+
+[Service]
+User=mailman
+Group=mailman
+Type=oneshot
+TimeoutStartSec=600
+EnvironmentFile=/opt/mailman-sync/env
+ExecStart=/usr/bin/python3.9 /opt/mailman-sync/mailman_sync.py \
+    --bin /usr/local/cpanel/3rdparty/mailman/bin/ \
+    --api https://paperwork.claremontmakerspace.org/api/v1/paperwork/certification_definition/mailing_lists.json \
+    --list-suffix _claremontmakerspace.org

systemd/mailman_sync.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Periodically synchronize Mailman lists to CMSManage API
+
+[Timer]
+OnCalendar=hourly
+Persistent=true
+
+[Install]
+WantedBy=timers.target