Add environment variable handling to Hono example

[arjunyel]

Summary

Add environment variable handling to Hono example

Checklist

• [ ] Added a docs PR that references this PR N/A
• [ ] Added unit/integration tests N/A
• [ ] Added changesets if applicable N/A

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Latest commit: 778b6d60a62b20d0d982df37eef5a806de102e8c

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[jpwilliams]

Thank you, @arjunyel! 🙌

I've put in a more long-term fix for this that shouldn't require the manual specification of signing/event keys, so I'll close this in favour of the PR at #571.

Would be awesome if you could test that out (npm install inngest@pr-571) and let me know if it also solves your issue. 🙂