Add support for JDK_JAVA_OPTIONS

[akefirad]

Describe the Enhancement

I'm not sure if it's bug or feature. But we need to support JDK_JAVA_OPTIONS environment variable. One specific use case is to add --add-opens flag which doesn't seem to be possible to do via JAVA_TOOL_OPTIONS anymore (tested on Java 17).

The full story is here. Thanks.

[dmikusa]

I commented on the SO post. I don't think there will need to be any changes in the buildpack here. You can set any arbitrary buildpack using pack or Spring Boot build tools. You just need to make sure it's set at the appropriate time.