Fix -e making its way into pip.conf

Author: pandaninjas

Dockerfile

@@ -15,8 +15,8 @@ RUN cd Python-${VERSION} && ./configure && make -j$(nproc) && make install
 
 RUN rm -rf Python-${VERSION} Python-${VERSION}.tgz /etc/apt/sources.list.d/debsrc.list
 
-RUN echo -e "[global]\nextra-index-url=https://www.piwheels.org/simple" > /etc/pip.conf 
+RUN echo "[global]\nextra-index-url=https://www.piwheels.org/simple" > /etc/pip.conf 
 # replicate raspberry pi os pip.conf
 
 # remove existing python3
-RUN apt remove -y python3
+RUN apt remove -y python3