How to Fix: "ERROR: cannot copy to non-directory" when copying to WORKDIR?

                The primary reason for this error is that the WORKDIR directive sets the working directory in the Dockerfile, but it does not create the directory if it does not exist. This means that when Docker tries to copy files into the WORKDIR, it checks if the directory exists and throws an error if it does not.Another alternative reason for this error is a mismatch between the expected destination and the actual location of the files being copied. In this case, the error message indicates that the destination '/var/lib/docker/overlay2/cytt3i5m23b6ce9iciljwb3c7/merged/lib' is not a directory, which prevents Docker from copying files into it.

            ✅ Best Solutions to Fix It

                Change the WORKDIR to a valid directory

                    Step 1: Replace the WORKDIR . with WORKDIR /tmp or another valid directory that exists on the host machine.Step 2: Update the Dockerfile to reflect the new WORKDIR directive.Step 3: Try rebuilding the Docker image with the updated Dockerfile.



                Use a different COPY command

                    Step 1: Replace the second COPY command ./* ./ with a different destination directory, such as ./dest.Step 2: Update the Dockerfile to reflect the new COPY command.Step 3: Try rebuilding the Docker image with the updated Dockerfile.


            💡 Conclusion
            To resolve the 'ERROR: cannot copy to non-directory' issue when copying to WORKDIR, change the WORKDIR directive to a valid directory that exists on the host machine, or use a different COPY command with a valid destination directory. By following these steps, you should be able to successfully build your Docker image.