Docs: Replace apt-key command with signed-by option (#44885)
Docs: Replace apt-key command with signed-by option (#44885)

* replace apt-key command with signed-by option

* add gpg command to meet debian best practices

* delete old file

* update filepath
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana