[FLINK-25041] E2E tar ball cache fails without error message if target directory not specified - ASF JIRA

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We want to verify if the variable has been set.

if [ -z "$E2E_TARBALL_CACHE" ] ; then
    echo "You have to export the E2E Tarball Cache as E2E_TARBALL_CACHE"
    exit 1
fi

but the shown code immediately fails with an `unbound variable` error if the variable is not set and it does not evaluate the branch.

We should change it to something like this

if [ "${E2E_TARBALL_CACHE+x}" == x ] ; then
    echo "You have to export the E2E Tarball Cache as E2E_TARBALL_CACHE" 
    exit 1
fi

links to

GitHub Pull Request #17896