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I’m just putting this here as it wasn’t an immediately clear fix. I was building the Traefik container image from source.

Error:

YN0001: │ RequestError: self-signed certificate in certificate chain

Fix:

In ~/.yarnrc.yaml or equivaqlent:

enableStrictSsl: false

Caveat - Be aware that this will prevent errors/warnings about unsafe TLS certificates, blah blah. If you’re already at this point you take full responsibility for what you’re doing.