Add an explicit ZApp for the clouds laboratory

5 jobs for master in 59 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #20049
build:spark-jupyter-notebook

00:00:14

passed #20050
build:spark-master

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passed #20051
build:spark-worker

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  Test
passed #20052
test:json

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  Push
passed #20053
push:hub

00:00:27