Update Dockerfile

Dockerfile

@@ -27,7 +27,7 @@ run ~/miniconda/bin/conda env create -f ./env.yml
 
 run git lfs install --force
 run git clone https://github.com/python/cpython
-run cd cpython && ./configure --enable-optimizations --with-lto --prefix=~/app/python --with-system-libmpdec=no > /dev/null
+run cd cpython && ./configure --enable-optimizations --with-lto --prefix=$HOME/app/python --with-system-libmpdec=no > /dev/null
 run cd cpython && make > /dev/null
 run cd cpython && make test > /dev/null
 run cd cpython && make install > /dev/null