This is a simple GitHub action that allows to send emails when a GitHub Check Suite completes. This requires a few environment variables:

• APP_NAME - Name of an application for which to send emails for.
• MAIL_FROM - email address to send emails from.
• MAIL_HOST - SMTP host to send emails to.
• MAIL_USERNAME and MAIL_PASSWORD - username and password to authorize with the SMTP server.
• GITHUB_TOKEN - is standard environment variable for GitHub actions.
• optional IGNORED_CONCLUSIONS to secify conclusions to report. By default only success and neutral checks are ignored.

Now your action can look liker this in your .github/main.workflow workflow file:

action "Cirrus CI Email" {
  uses = "docker://cirrusactions/email:latest"
  env = {
    APP_NAME = "Cirrus CI"
  }
  secrets = ["GITHUB_TOKEN", "MAIL_FROM", "MAIL_HOST", "MAIL_USERNAME", "MAIL_PASSWORD"]
}