test: fix test setup

To be like the default setup

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Add gradle build template files

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Install the Gradle wrapper in the workspace

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>