`fly auth docker` fixed flyctl deployment

Hello,
I attempted to deploy by fly deploy but got Registry 401 auth error, blocking the deployment. I did two things:

  • major update to flyctl from 0.3.x to 0.4.6 — I haven’t used that machine for a while.
  • fly auth docker — see its doc.

It fixed the problem. However, neither of these two seem relevant to the error. See an earlier post.

For learning and for the record of other users, would you illustrate some explanation hypothesis?

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