Trim unneeded bits from builder dockerfile

docker/builder/Dockerfile

@@ -14,22 +14,16 @@ ENV BUILD_DIR /src/consumerfinance.gov
 RUN mkdir -p ${BUILD_DIR} && chmod 777 ${BUILD_DIR}
 WORKDIR ${BUILD_DIR}
 
-# Sets a consistent $HOME no matter which user the container runs under. This
-# prevents permissions issues caused by Docker's default `/` home directory.
-ENV HOME /tmp/dfd-home
-RUN mkdir -p ${HOME} && chmod 777 ${HOME}
-
 # Install all build requirements including Python 3 and the latest
 # versions of the Python packages pip, setuptools, and wheel. Configure
 # Python 3 to be enabled at login.
 RUN yum -y update && \
     yum install -y centos-release-scl && \
     yum install -y rh-python38 gcc git && \
-    echo "source scl_source enable rh-python38" > /etc/profile.d/scl_python.sh && \
     source /etc/profile && \
     pip install --no-cache-dir -U pip setuptools wheel && \
     pip3 install --no-cache-dir -U pip setuptools wheel
 
-COPY _build.sh docker-entrypoint.sh ./
+COPY call_create.sh docker-entrypoint.sh ./
 
 ENTRYPOINT ["./docker-entrypoint.sh"]