

I wouldn’t build anything significant on the RPi Zero and instead would try to build elsewhere, namely on a more powerful machine with the same architecture, or cross-build as others suggested.
That being said, what’s interesting IMHO with container image building is that you can rely on layers. So… my advice would be to find the existing image supported by your architecture then rely on it to layer on top of it. This way you only build on the RPi what is truly not available elsewhere.
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