Dockerfile COPY cannot find the file

COPY failed: file not found in build context or excluded by .dockerignore: stat <Filename>: file does not exist
FROM Ubuntu
COPY ~/.ssh/known_host /root/known_host
DOCKER_BUILDKIT=1  docker build  -t test123  .

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Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store