fix(gameserver): ensure JDK image with Attach API is used for build

[andrewazores]

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See #14 There seems to be a distinction between ex. :java17 and java17-jdk images, where java17 is something like a JRE image instead of a full JDK. It doesn't contain tools.jar and therefore the Attach API, used by our Agent, is unavailable and attempting to attach the Agent results in a runtime error and failure of the container to start.