Add environment spark command

[paulbalandan]

Description
Adds a spark command to show/change the current environment. Changes will be effected in the next script execution.

$ php spark env
# Your current environment is set as testing.

$ php spark env development
# Environment successfully changed to "development".

Checklist:

• Securely signed commits
• Component(s) with PHPdocs
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[MGatner]

I like this, very helpful and easy to use. This commits us to a baseline env that is entirely comments - this is currently the case and I believe this was always the intention, but is there some place we could make note of this "for future generations"? (i.e. for me when I forget next week) Maybe somewhere in contributing/ we need some more "policies" or something?

[paulbalandan]

I like this, very helpful and easy to use. This commits us to a baseline env that is entirely comments - this is currently the case and I believe this was always the intention, but is there some place we could make note of this "for future generations"? (i.e. for me when I forget next week) Maybe somewhere in contributing/ we need some more "policies" or something?

I'm not sure I get what you mean. Are you referring to the env file?

[MGatner]

Right, since this command will publish the template (env) to a live .env we need to be certain that our repo version of the template is all comments, otherwise using this command could cause accidental environment settings.

I was looking for ideas of where we could track this - maybe add it to https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/internals.rst ?

[paulbalandan]

Understood. Will look into this.

[MGatner]

Thanks! Looks great. Re-approve!