[FEATURE] Environment variable to simplify --token global flag

[mroy-seedbox]

Description of the problem being solved

When using the Slack CLI in CI/CD pipelines today, an auth token must be used (instead of the traditional slack login method). This requires the usage of the --token global flag in every single command (commands which may very well appear in logs, etc.)

Instead, it would be much more secure (and also convenient) to allow an environment variable to be used as a fallback for the global flag. This is already the case for --config-dir, which can be specified via SLACK_CONFIG_DIR instead (see documentation here).

It would be wonderful if we could also specify an environment variable like SLACK_AUTH_TOKEN, instead of specifying --token for every command.

Alternative solutions

Being able to log in with a token (and not having to keep repeating it afterwards).

However, an environment variable would be even better (and probably easier to implement as well).

[hello-ashleyintech]

Hi, @mroy-seedbox! Thanks for submitting this! :) I will pass this along to our CLI folks as a potential refinement for the future; will update back with any new info! 🙌

[mroy-seedbox]

Here is another place where things could be simplified by using an env var directly instead of a CLI flag:

Slack CLI Deployment using GitHub Actions