feat: inject netlify graph environment variables during ntl build

[anmonteiro]

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Summary

Fixes #4182

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[github-actions]

📊 Benchmark results

Comparing with 550c5c0

Package size: 443 MB

(no change)

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Legend

• T-30 (550c5c0): 443 MB
• T-29 (b3f0522): 443 MB
• T-28 (983b2a5): 443 MB
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• T-21 (3b7765c): 443 MB
• T-20 (88985c4): 443 MB
• T-19 (110eed6): 443 MB
• T-18 (cd3787c): 443 MB
• T-17 (d9f62e0): 443 MB
• T-16 (fad5ef6): 443 MB
• T-15 (5ea7686): 447 MB
• T-14 (483f51a): 447 MB
• T-13 (7ef657d): 447 MB
• T-12 (2decc3e): 447 MB
• T-11 (69261cd): 443 MB
• T-10 (0c0fded): 443 MB
• T-9 (9155efb): 443 MB
• T-8 (73793bf): 443 MB
• T-7 (809f9d7): 443 MB
• T-6 (ed66573): 443 MB
• T-5 (9c89252): 443 MB
• T-4 (88be608): 443 MB
• T-3 (57b199e): 443 MB
• T-2 (c03ac2b): 443 MB
• T-1 (c497ef8): 443 MB
• T (current commit): 443 MB

[sgrove]

lgtm!