Bugfixes for docker build and start scripts + readme

docker/deepspeed/build-deepspeed.sh

@@ -23,7 +23,7 @@ while [ "$#" -gt 0 ]; do
       DOCKER_TAG="$2"
       shift
       ;;
-    --github-repository)
+    --docker-repository)
       if [ -n "$2" ] && ! [[ $2 =~ ^--.* ]]; then
         DOCKER_REPOSITORY="$2"
         shift
@@ -39,6 +39,9 @@ while [ "$#" -gt 0 ]; do
   shift
 done
 
+# Append slash if missing:
+DOCKER_REPOSITORY=$(echo "$DOCKER_REPOSITORY" | sed 's![^/]$!&/!')
+
 PYTHON_SHORT_VERSION=${PYTHON_VERSION%.*}
 PYTHON_VERSION_NO_DOT=${PYTHON_SHORT_VERSION//./}
 if [[ -n $(find build -name "deepspeed-${DEEPSPEED_VERSION}*-cp${PYTHON_VERSION_NO_DOT}-cp${PYTHON_VERSION_NO_DOT}-*.whl") ]]