Create GitHub team for read-only mirros

archlinux-github needs at least write access so it can close PRs.

https://gitlab.archlinux.org/archlinux/github-pull-closer/

The existing mirrors has been added to the new team with this script:

#!/bin/bash
set -o nounset -o errexit
TOKEN="ghp_xxx"

READ_ONLY_MIRRORS_IDS="$(curl -sSf -H "Accept: application/vnd.github.v3+json" https://api.github.com/orgs/archlinux/repos?per_page=100 | jq -r '.[] | select(.description | contains("read-only mirror")) | .full_name')"

IFS=$'\n' 
for full_name in ${READ_ONLY_MIRRORS_IDS}; do
  echo $full_name
  curl \
    -X PUT \
    -H "Authorization: token ${TOKEN}" \
    -H "Accept: application/vnd.github.v3+json" \
    "https://api.github.com/orgs/archlinux/teams/read-only-mirrors/repos/${full_name}" \
    -d '{"permission":"push"}'
done

closed with commit 731293d3

mentioned in commit 731293d3