fix(command-functions): inject env variables to functions:serve

[erezrokah]

- Summary

Fixes #2922

- Test plan

Added a test case

- A picture of a cute animal (not mandatory but encouraged)
🐘

[github-actions]

📊 Benchmark results

Comparing with e459351

Package size: 330 MB

(no change)

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└───┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴──>
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Legend

• T-30 (e459351): 330 MB
• T-29 (320d42f): 330 MB
• T-28 (b7f84e4): 330 MB
• T-27 (20a9de9): 330 MB
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• T-22 (32c6086): 330 MB
• T-21 (ced0c93): 330 MB
• T-20 (7ccf859): 330 MB
• T-19 (278557a): 330 MB
• T-18 (db8c431): 330 MB
• T-17 (a53b36f): 330 MB
• T-16 (08d87ff): 329 MB
• T-15 (0767251): 329 MB
• T-14 (307e128): 330 MB
• T-13 (c68efb2): 330 MB
• T-12 (bbb78bd): 330 MB
• T-11 (2c6a57a): 330 MB
• T-10 (8bfdb2f): 330 MB
• T-9 (2e18003): 330 MB
• T-8 (fd3d2f7): 330 MB
• T-7 (d451cb3): 330 MB
• T-6 (c381072): 330 MB
• T-5 (537b760): 330 MB
• T-4 (172c955): 330 MB
• T-3 (259dd5f): 330 MB
• T-2 (9f41225): 330 MB
• T-1 (9f0ff3f): 329 MB
• T (current commit): 330 MB