RFR: Add SKARA_JAVA_OPTS env variable to launchers

[Kevin Rushforth]

On Fri, 14 May 2021 23:19:10 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> This change adds the possibility of adding java options used when running a Skara image (such as the bots) though the environment variable SKARA_JAVA_OPTS.

Looks good.

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Marked as reviewed by kcr (Committer).

PR: https://git.openjdk.java.net/skara/pull/1158