Add shared GH workflows

[patrikk0123]

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[dwalluck]

@rnc @patrikk0123 Add

java_version: "11"

here I think? maven-pr has one, but maven-release and maven-snapshot do not. I was porting this over to kojiji, and I noticed some difference between the files.

[rnc]

Huh, good spot! @patrikk0123 Yes, I think this does need it as the default is 21 otherwise.

[patrikk0123]

yes my bad, thanks!

[dwalluck]

@patrikk0123 @rnc I guess maven-set-version, too. Not as important, because I don't think it builds, but I think for consistency we should use the same JDK?