flyctl build-secret cannot be multiline breaking necessary private key format

[ignoramous]

@Arowana

As far as i know, i cannot alter the format of the private key to make it work.

If you can alter it, base64 the secret without wrapping lines?

@ignoramous

B64NOWRAP_KEY="$(base64 -w0 /path/to/key)"

And un-base64 it before reading it back.

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@Arowana

The docker build works on its own with the following command, to add a secret SSH_PRV_KEY which is an ed25519 private key file

Fly’s builders don’t use buildkit, btw. But if you need to, I guess you can build the docker image offline (on a AMD/Intel machine), you can later push it to Fly: Push to Fly.io image registry via Docker API - #2 by ignoramous

In case you didn’t know (and if it fits your needs):

• flyctl deploy --local-only builds a docker image locally (as opposed to on a Fly builder) and deploys it to your app.
• flyctl deploy --local-only --build-only builds the image locally and pushes it to Fly’s docker registry, which you can later deploy (docs).