add nextcloud public calendar export

.gitignore

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+events.json

bin/calendar-events-exporter.sh

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+#!/usr/bin/env bash
+
+curl -sH "Accept: application/calendar+json" "https://cloud.kraut.space/remote.php/dav/public-calendars/2EkPGt3PF6WwYsA3?export&expand=1&start=$(date -d "" +%s)&end=$(date -d "next month" +%s)" \
+	| jq -r '.[2] | map({_type: .[0]} + (.[1] | map({key: .[0], value: .[3]}) | from_entries))' \
+	> ./events.json

etc/systemd/calendar-events-exporter.service

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+[Unit]
+Description=Dumps calendar events from nextcloud into usable json
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/bash /var/www/kraut.space/bin/calendar-events-exporter.sh
+
+User=www-data
+Group=www-data
+
+WorkingDirectory=/var/www/kraut.space

etc/systemd/calendar-events-exporter.timer

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+[Unit]
+Description=timer for automatic refresh of calendar export
+
+[Timer]
+# execute at the second minute of every hour, and repeat every 5 minutes
+OnCalendar=*:2/5
+
+[Install]
+WantedBy=timers.target