3.1.0 - Python and R Spark kernel images won't start

[kevin-bates]

The elyra/kernel-spark-py:3.1.0 and elyra/kernel-spark-r:3.1.0 images fail to start due to the following:

$ docker run -it --rm elyra/kernel-spark-py:3.1.0 bash
++ id -u
+ myuid=1000
++ id -g
+ mygid=100
+ set +e
++ getent passwd 1000
+ uidentry=jovyan:x:1000:100::/home/jovyan:/bin/bash
+ set -e
+ '[' -z jovyan:x:1000:100::/home/jovyan:/bin/bash ']'
+ SPARK_CLASSPATH=':/opt/spark/jars/*'
+ env
+ sort -t_ -k4 -n
+ sed 's/[^=]*=\(.*\)/\1/g'
+ grep SPARK_JAVA_OPT_
+ readarray -t SPARK_EXECUTOR_JAVA_OPTS
+ '[' -n '' ']'
+ '[' -z ']'
+ '[' -z ']'
+ '[' -n '' ']'
+ '[' -z ']'
+ '[' -z ']'
+ '[' -z x ']'
+ SPARK_CLASSPATH='/opt/spark/conf::/opt/spark/jars/*'
+ case "$1" in
+ echo 'Non-spark-on-k8s command provided, proceeding in pass-through mode...'
Non-spark-on-k8s command provided, proceeding in pass-through mode...
+ CMD=("$@")
+ exec /usr/bin/tini -g -- bash
/opt/entrypoint.sh: line 105: /usr/bin/tini: No such file or directory

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