Try using CRYPTOGRAPHY_DONT_BUILD_RUST again

docker/3_buildwheels/Dockerfile

@@ -13,6 +13,7 @@ RUN set -ex; \
     libjpeg-dev \
     zlib1g-dev
 
+ENV CRYPTOGRAPHY_DONT_BUILD_RUST 1
 ENV WHEELHOUSE=/data/wheelhouse
 ENV PIP_WHEEL_DIR=/data/wheelhouse
 ENV PIP_FIND_LINKS=/data/wheelhouse

docker/4_run/Dockerfile

@@ -28,6 +28,7 @@ ENV APACHE_LOCK_DIR /var/lock/apache2
 RUN mkdir -p $APACHE_RUN_DIR $APACHE_LOCK_DIR $APACHE_LOG_DIR
 
 ADD wheelhouse /data/wheelhouse
+ENV CRYPTOGRAPHY_DONT_BUILD_RUST 1
 RUN pip3 install --no-index --find-links=/data/wheelhouse -r /data/wheelhouse/requirements.txt
 
 VOLUME /data/config
@@ -35,7 +36,6 @@ VOLUME /data/storage
 VOLUME /var/log
 
 ENV USE_X_SENDFILE True
-ENV CRYPTOGRAPHY_DONT_BUILD_RUST 1
 
 EXPOSE 80
 EXPOSE 5000