fix: always build for amd64 when building go functions

[danez]

I noticed that we build for whatever architecture the current host has. Which when for example building locally on M1 MacBook probably creates Linux/arm64 binary which would be wrong, but even if not I feel saver by defining it explicitly.

Ref: https://github.com/netlify/pillar-runtime/issues/231

[github-actions]

⏱ Benchmark results

Comparing with 5083bb2

largeDepsEsbuild: 6.9s

⬇️ 22.50% decrease vs. 5083bb2

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│   |  |                    6.9s  
│ ──┼──┼────────────6.5s────┌──┐──
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│   |  |    5.6s    |  |    |▒▒|  
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└───┴──┴────┴──┴────┴──┴────┴──┴──>
    T-3     T-2     T-1      T    

Legend

• T-3 (5083bb2): 8.4s
• T-2 (dddd4f8): 5.6s
• T-1 (04a68c8): 6.5s
• T (current commit): 6.9s

largeDepsNft: 34.2s

⬇️ 26.29% decrease vs. 5083bb2

^  43.2s                          
│   ┌──┐                          
│   |  |                          
│   |  |                          
│   |  |                   34.2s  
│ ──┼──┼────────────────────┌──┐──
│   |  |           29.6s    |▒▒|  
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└───┴──┴────┴──┴────┴──┴────┴──┴──>
    T-3     T-2     T-1      T    

Legend

• T-3 (5083bb2): 43.2s
• T-2 (dddd4f8): 27s
• T-1 (04a68c8): 29.6s
• T (current commit): 34.2s

largeDepsZisi: 51.7s

^                          51.7s  
│                           ┌──┐  
│                   46s     |▒▒|  
│ ──────────────────┌──┐────|▒▒|──
│          41.7s    |  |    |▒▒|  
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└───────────┴──┴────┴──┴────┴──┴──>
    T-3     T-2     T-1      T    

Legend

• T-3 (5083bb2): n/a
• T-2 (dddd4f8): 41.7s
• T-1 (04a68c8): 46s
• T (current commit): 51.7s

[eduardoboucas]

Maybe it'd be nice to make this configurable in the future, in case we start using a different arch in Lambda (like ARM).

This is great for now, though! ✨