apt-key add

curl https://repos.insights.digitalocean.com/sonar-agent.asc | sudo apt-key add -

GitLab

curl --silent https://packages.gitlab.com/gpg.key | sudo apt-key add -

logstash

wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
OK

Related

• apt-transport-https
• /etc/apt/sources.list.d/

See also

• apt-key, apt-key [ add | adv | list ], apt-key --keyring, apt-key --help