[CMake] Docker container can't find cmake executable

[Osman Zakir]

I put this command in the Dockerfile:
"
RUN mkdir $HOME/usr \
    && wget -O cmake-linux.sh https://cmake.org/files/v3.12/cmake-3.12.3-Linux-x86_64.sh \​
    && sh cmake-linux.sh -- --skip-license --prefix=$HOME/usr \​
    && cd $HOME/usr \​
    && ls \​
    && export PATH=$HOME/usr/bin:$PATH
"
But when it gets to running CMake, it can't find the executable.  Please help.
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