Uppmcfch 62 No hard coded environment variables for java 1.8

We need to avoid hard coding environment variables in the Dockerfile for java1.8.

@marc.cooper

References:

https://dccscr.dsop.io/dsop/dccscr/issues/5

https://jenkins-jenkins-demo.52.61.140.4.nip.io/job/Hardening%20Pipelines/job/openjdk-1.8-hardening/79/