Fix jlink image warnings #870

Job	Run time
checkstyle	3m 30s
shellcheck	3m 7s
build	5m 3s
copyright	3m 20s
vscode-ext	3m 51s
cli/windows-amd64	6m 31s
javadoc	4m 9s
cli/linux-amd64	5m 30s
spotbugs	5m 57s
cli/darwin-amd64	6m 12s
tests/cli-linux	3m 59s
tests/cli-functional-linux	6m 43s
tests/cli-windows	4m 24s
tests/others-linux	6m 6s
tests/linker-windows	5m 51s
tests/cli-functional-windows	6m 54s
tests/others-windows	7m 52s
tests/archetype-linux	5m 15s
tests/archetype-windows	5m 51s
tests/linker-linux	5m 24s
cli/binaries	13s
tests/results	4s
gate	2s
	1h 45m 48s

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