Fix JDK overlay directory (#763) #980

Job	Run time
Unit Tests	57s
Rust Code Linting	42s
Integration Tests (buildpacks/gradle, builder:24, amd64)	4m 54s
Integration Tests (buildpacks/jvm, builder:24, amd64)	3m 23s
Integration Tests (buildpacks/maven, builder:24, amd64)	4m 50s
Integration Tests (buildpacks/sbt, builder:24, amd64)	6m 38s
Integration Tests (buildpacks/gradle, builder:24, arm64)	3m 58s
Integration Tests (buildpacks/jvm, builder:24, arm64)	2m 24s
Integration Tests (buildpacks/maven, builder:24, arm64)	7m 21s
Integration Tests (buildpacks/sbt, builder:24, arm64)	7m 25s
Integration Tests (buildpacks/gradle, builder:22, amd64)	4m 38s
Integration Tests (buildpacks/jvm, builder:22, amd64)	3m 23s
Integration Tests (buildpacks/jvm-function-invoker, builder:22, amd64)	3m 52s
Integration Tests (buildpacks/maven, builder:22, amd64)	6m 36s
Integration Tests (buildpacks/sbt, builder:22, amd64)	6m 59s
Integration Tests (buildpacks/gradle, builder:20, amd64)	4m 46s
Integration Tests (buildpacks/jvm, builder:20, amd64)	3m 18s
Integration Tests (buildpacks/maven, builder:20, amd64)	3m 10s
Integration Tests (buildpacks/sbt, builder:20, amd64)	6m 42s
	1h 25m 56s

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