This uses the GitHub API to mark notifications as read if they meet a certain criteria (closed/merged/OoO/Backport/etc)

mark_read.sh

#!/bin/bash

mark_read() {
	id=$1
	curl -H "$CURLH" -s -X PATCH $API/notifications/threads/$id
}

CURLH="Authorization: token $GITHUB_TOKEN"
API=https://api.github.com

pages=$(curl -isH "Authorization: token $GITHUB_TOKEN" -I $API/notifications | grep '^Link: ' | egrep -o 'page=[0-9]+' | tail -n 1 | egrep -o '[0-9]+')

for page in `seq 1 $pages` ; do
	echo Page $page >&2

	urls=$(curl -H "$CURLH" -s "$API/notifications?page=$page" | jq -r '.[] | .id + " " + .subject.url')
	echo -e "$urls" | while read -r id url ; do
		echo -n $url
		data=$(curl -H "$CURLH" -s $url)
		state=$(echo $data | jq -r ".state")
		title=$(echo $data | jq -r ".title")
		ooo=" OoO "
		if [ "$state" == "closed" ] || [ "$state" == "merged" ] ; then
			echo " $state" >&2
			mark_read $id
		elif [[ "$title" =~ ^Backport ]] ; then
			echo " $title" >&2
			mark_read $id
		elif [[ "$title" =~ $ooo ]] || [[ "$title" =~ ^configuration\.sh ]] ; then
			echo " $title" >&2
			mark_read $id
		else
			echo
		fi
	done
done