Use regular docker runtime runc

Jenkins currently defaults to the nvidia docker runtime, however learntools only uses CPU tests and the colab image conflicts with the nvidia docker runtime when in CPU-only mode.

http://b/365782129

Author: djherbis

test.sh

@@ -80,7 +80,7 @@ set -x
 
 # Allows pinned notebooks to be tested independently. 
 if [[ $TRACK  == "computer_vision" || $TRACK == "deep_learning_intro" ]]; then
-    docker run --rm -t \
+    docker run --runtime runc --rm -t \
     -e KAGGLE_USERNAME -e KAGGLE_KEY \
     -v ~/.kaggle:/root/.kaggle:ro \
     -v $PWD:/input:ro \
@@ -91,15 +91,15 @@ fi
 
 
 if [[ $TRACK == "all" ]]; then
-    docker run --rm -t \
+    docker run --runtime runc --rm -t \
     -e KAGGLE_USERNAME -e KAGGLE_KEY \
     -v ~/.kaggle:/root/.kaggle:ro \
     -v $PWD:/input:ro \
     $PINNED_IMAGE \
     /bin/bash -c "/input/notebooks/test.sh kerasExp"
 fi
 
-docker run --rm -t \
+docker run --runtime runc --rm -t \
     -e KAGGLE_USERNAME -e KAGGLE_KEY \
     -v ~/.kaggle:/root/.kaggle:ro \
     -v $PWD:/input:ro \