fix: nango-github-sync frequency

[mbani01]

This pull request makes a minor fix to the cron job interval logic in the nango-github-sync job definition. The change ensures that the fallback interval calculation correctly applies the development environment check.

• Fixed the fallback logic for the CROWD_GH_NANGO_SYNC_INTERVAL_MINUTES environment variable to properly use the development environment default of 5 minutes, or 60 minutes otherwise.
• Defined CROWD_GH_NANGO_SYNC_INTERVAL_MINUTES as an env var since it was missing

---

Note

Low Risk
Small, localized change to cron scheduling logic; impact is limited to how often the job runs when the interval env var is unset.

Overview
Fixes the nango-github-sync cron interval calculation by adding parentheses so the CROWD_GH_NANGO_SYNC_INTERVAL_MINUTES env-var fallback correctly evaluates to 5 minutes in dev and 60 minutes otherwise.

This prevents operator-precedence bugs where the dev default could be incorrectly bypassed when the env var is unset.

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