fix envvar naming

Signed-off-by: Sebastian Schüpbach <sebastian.schuepbach@unibas.ch>
3 jobs for master in 7 minutes and 13 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #74766
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test-sbt

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  Build
passed #74767
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assembly-sbt

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  Publish
passed #74768
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build-latest-image

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