fix(cache): replace , in MISE_ENV with -

[risu729]

Fixes #276

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Note

Replaces commas in MISE_ENV with hyphens when constructing the cache key to ensure stable/valid keys.

• Cache Key Generation:
  • In src/index.ts, normalizes MISE_ENV via replace(/,/g, '-') and uses it as mise_env when building the cache key template.

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