infra: check GITHUB_READ_ONLY_TOKEN in tweet-releasenotes.sh
infra: check GITHUB_READ_ONLY_TOKEN in tweet-releasenotes.sh

rnveach/checkstyle,checkstyle/checkstyle,romani/checkstyle,checkstyle/checkstyle,romani/checkstyle,romani/checkstyle,checkstyle/checkstyle,checkstyle/checkstyle,romani/checkstyle,rnveach/checkstyle,rnveach/checkstyle,checkstyle/checkstyle,romani/checkstyle,rnveach/checkstyle,rnveach/checkstyle,checkstyle/checkstyle,romani/checkstyle,rnveach/checkstyle