背景 Let's Encryptで発行したSSL証明書が3月31日に切れる📴 どうせ更新するなら、自動化したいなぁ🤔 お、丁度いいタイミングでHerokuさんのプレスリリースが... Automated Certificate Management https://devcenter.heroku.com/articles/automated-certificate-management With Automated Certificate Management (ACM), Heroku automatically manages TLS certificates for all apps that have Hobby and Professional dynos on the Common Runtime. Certificates handled by ACM automati