The docker channel is stable and not edge

Author: afbjorklund

Dockerfile

@@ -418,7 +418,7 @@ RUN wget -O usr/local/sbin/cgroupfs-mount "https://github.com/tianon/cgroupfs-mo
 ENV DOCKER_VERSION 19.03.15
 
 # Get the Docker binaries with version that matches our boot2docker version.
-RUN DOCKER_CHANNEL='edge'; \
+RUN DOCKER_CHANNEL='stable'; \
 	case "$DOCKER_VERSION" in \
 # all the pre-releases go in the "test" channel
 		*-rc* | *-beta* | *-tp* ) DOCKER_CHANNEL='test' ;; \