Echo all scripts in the wheelbuilder

docker/3_buildwheels/build.sh

@@ -33,6 +33,7 @@ docker run --rm -i \
     -v "$TOPDEVDIR:/data/topdev" \
     $DOCKER_IMAGE_NAME <<EOT
 set -e
+set -x
 
 # Globally upgrade Pip, so that we can get a compatible version of the cryptography package.
 # See https://github.com/pyca/cryptography/issues/5771