Fill gaps from assistant conversations: checkMatch arrays and env add

[mintlify]

Summary

Close two documentation gaps surfaced by recurring assistant conversations: how to match multiple file globs with checkMatch, and what to do when checkly env add targets a key that already exists.

Changes

• constructs/project.mdx: correct checks.checkMatch type from string to string | string[] in both the properties table and the ResponseField, and add an inline example showing an array of globs.
• constructs/including-checks.mdx: note that checkMatch also accepts an array of glob patterns, with an example matching multiple file extensions.
• cli/checkly-env.mdx: add a note under checkly env add clarifying that it is for creating new variables only, pointing users to checkly env update for existing keys and to checkly env rm + add --secret for converting a plain variable to a secret.

Context

Assistant sessions repeatedly asked how to include multiple check file extensions and what happens when env add is called for an existing key; the existing pages were ambiguous or silent on both points.

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