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It took a bit of digging, but it seems that encrypted wifi is not supported:
https://github.com/gokrazy/gokrazy/issues/13
And if you read the issue, it's a bit understandable to not want to reimplement wpa_supplicant.
Is this kinda like the Nerves approach but for Golang? (https://github.com/nerves-project/nerves)
If you want to go deeper, there is also bare-metal Go runtime for rpi (among others): https://github.com/f-secure-foundry/tamago