Switching to container ID for container reference

Rather than container name.
Makes concurrency easier.

scripts/rundocker.sh

@@ -1,11 +1,9 @@
 #!/bin/bash
 
 CONTAINER_HOME=/home/kivy
-CONTAINER_NAME=android_container
 
 # create the container to be used throughout the script
-echo -ne "Creating container ${CONTAINER_NAME} \n\t id: "
-docker create -it --name ${CONTAINER_NAME} \
+CONTAINER_ID=$(docker create -it --name ${CONTAINER_ID} \
   --mount type=bind,src=${PWD}/whl,dst=${CONTAINER_HOME}/whl \
   --mount type=bind,src=${PWD}/src,dst=${CONTAINER_HOME}/src \
   --mount type=bind,src=${PWD}/scripts,dst=${CONTAINER_HOME}/scripts \
@@ -16,26 +14,28 @@ docker create -it --name ${CONTAINER_NAME} \
   --env P4A_RELEASE_KEYALIAS \
   --env P4A_RELEASE_KEYSTORE_PASSWD \
   --env P4A_RELEASE_KEYALIAS_PASSWD \
-  android_kolibri
+  android_kolibri)
+
+echo -ne "Creating container ${CONTAINER_ID} \n\t id: "
 
 # make sure the environment variable is defined
 if [ "${P4A_RELEASE_KEYSTORE}" ]; then
   # make sure the directory is valid
   if [ -a ${P4A_RELEASE_KEYSTORE} ]; then
-    echo -e "Copying the signing key \n\t From ${P4A_RELEASE_KEYSTORE} to ${CONTAINER_NAME}:${CONTAINER_HOME}"
+    echo -e "Copying the signing key \n\t From ${P4A_RELEASE_KEYSTORE} to ${CONTAINER_ID}:${CONTAINER_HOME}"
     # copy keystore to same location on the container
-    docker cp ${P4A_RELEASE_KEYSTORE} ${CONTAINER_NAME}:${CONTAINER_HOME}
+    docker cp ${P4A_RELEASE_KEYSTORE} ${CONTAINER_ID}:${CONTAINER_HOME}
   fi
 fi
 
 # run the container, generating the apk
-echo "Starting ${CONTAINER_NAME}"
-docker start -i ${CONTAINER_NAME}
+echo "Starting ${CONTAINER_ID}"
+docker start -i ${CONTAINER_ID}
 
 # copy the apk to our host. Handles permissions.
-echo -e "Coping APK \n\t From ${CONTAINER_NAME}:${CONTAINER_HOME}/dist/ to ${PWD}"
-docker cp ${CONTAINER_NAME}:${CONTAINER_HOME}/dist/ .
+echo -e "Coping APK \n\t From ${CONTAINER_ID}:${CONTAINER_HOME}/dist/ to ${PWD}"
+docker cp ${CONTAINER_ID}:${CONTAINER_HOME}/dist/ .
 
 # manually remove the container afterward
 echo -n "Removing "
-docker rm ${CONTAINER_NAME}
+docker rm ${CONTAINER_ID}