Add JAVA_HOME env var back to CI Docker image

[ashb]

I mistakenly removed this in #8919, but it is needed for Hadoop to
function

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[ashb]

Damn

[dimberman]

@ashb yup, was gonna mention it tonight (didn't want to bother you if you were off for the day)

[ashb]

Not sure I can fix it, maybe we change default-jre-headless to default-jdk-headless in Dockerfile.ci

Could you try that @dimberman ?

[ashb]

This is failing now because Hive isn't creating (or has corrupt) meta store. But that doesn't seem to be related to JDK vs JRE. Confused

[ashb]

Think I've got a fix -- using https://adoptopenjdk.net/index.html instead.

[ashb]

Closing in favour of #8938