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First, is there a file called

Dockerfile

or

Containerfile

in that directory?

yes, the build will work fine if using docker ❯ ls Dockerfile Procfile app.py kube requirements.txt static templates ❯ nerdctl build -t local/app . WARN[0000] lstat /mnt/wslg/rancher-desktop/run/nerdctl-tmp.1575948084/input.3962298902/Dockerfile: no such file or directory, using Containerfile as fallback FATA[0000] lstat /mnt/wslg/rancher-desktop/run/nerdctl-tmp.1575948084/input.3962298902/Containerfile: no such file or directory