Implement local environment flagging mechanism

[toyamarinyon]

In the local environment, environment variables can be used to mimic the Vercel Toolbar.

Changes:

• Add utility function to evaluate flags based on local environment
• Replace hardcoded return values with calls to the new function
• This enhancement allows better control of feature flags during development

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
giselle	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 29, 2024 7:53am

[shige]

LGTM 👍

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OTA

These feature flags work with the following environments.

• preview
• development

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IMO

I thought that using the FLAG_ prefix might make the code for environment variables more readable, but I’ll leave it up to you since it's a matter of personal preference.

[toyamarinyon]

I thought that using the FLAG_ prefix might make the code for environment variables more readable, but I’ll leave it up to you since it's a matter of personal preference.

I understand. In this case, I used the name of the environment variable aligned with the name of the variable in the code, but in the future, if there are any problems, I would be happy to add the suggested Prefix to the form.

https://github.com/route06inc/giselle/blob/a22c35997bd0b63b21e52160383716a7bf544dbd/flags.ts#L15-L65