Added sample systemd unit files for deployment

deployments/systemd-unit-files/clean-docker-images.service

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+[Unit]
+Description="Clean up docker images"
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/docker system prune --all --force
+User={CHANGE_ME}

deployments/systemd-unit-files/clean-docker-images.timer

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+[Unit]
+Description="Timer for the clean-docker-images service"
+
+[Timer]
+Unit=clean-docker-images.service
+OnCalendar=Sun *-*-* 01:00:00
+Persistent=true
+
+[Install]
+WantedBy=timers.target

deployments/systemd-unit-files/webhook.service

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+# systemd service file for the webhook server
+# - Create the `/etc/systemd/system/webhook.service` file with these contents
+# - Run `sudo systemctl daemon-relaod`
+# - Finally run sudo systemctl start webhook.conf
+
+[Service]
+Environment="WEBHOOK_SECRET={CHANGE_ME}"
+ExecStart=/usr/bin/webhook -template -port {CHANGE_ME} -hooks {CHANGE_ME}
+User={CHANGE_ME}
+Group={CHANGE_ME}