[1] 
[[CI]] の実行環境変数では実行対象等についての[[環境変数]]が設定されます。

* 環境変数の一覧

- [2] [[Drone CI]]
-- [3] [CITE[Reference | [[Drone]]]], [TIME[2022-04-28T06:08:34.000Z]] <https://docs.drone.io/pipeline/environment/reference/>
- [4] [[GitHub Actions]]: >>18
- [5] [[CircleCI]]
-- [6] [CITE@en[Using Environment Variables - [[CircleCI]]]], [TIME[2022-04-28T04:04:25.000Z]], [TIME[2022-04-28T06:14:50.039Z]] <https://circleci.com/docs/2.0/env-vars/#built-in-environment-variables>


* 環境変数 [CODE[CI]]

[16] 
[[Travis CI]] や [[CircleCI]]
は実行時に[[環境変数]]
[DFN[[CODE[CI]]]]
を設定します。


[17] [CITE[CI | Drone]], [TIME[2022-03-25T02:44:55.000Z]] <https://docs.drone.io/pipeline/environment/reference/ci/>

[18] [CITE@en[Environment variables - GitHub Docs]], [TIME[2022-03-25T02:45:31.000Z]] <https://docs.github.com/en/actions/learn-github-actions/environment-variables#default-environment-variables>

* メモ