test: verify that volumes are cleanup up automatically

Uses reflection to access the internal cleanup helper and invoke them as if all tests were finished.
Verifies that the `ZeebeVolume` is automatically deleted because the correct labels are applied

core/src/test/java/io/zeebe/containers/ZeebeVolumeTest.java

@@ -22,6 +22,8 @@
 import com.github.dockerjava.api.command.InspectVolumeResponse;
 import com.github.dockerjava.api.model.AccessMode;
 import com.github.dockerjava.api.model.Bind;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
 import java.util.Map;
 import org.junit.jupiter.api.Test;
 import org.testcontainers.DockerClientFactory;
@@ -97,6 +99,39 @@ void shouldAttachToZeebeBroker() {
     }
   }
 
+  @Test
+  void shouldCleanupVolume() {
+    // given
+    final DockerClient client = DockerClientFactory.lazyClient();
+    final ZeebeVolume volume = ZeebeVolume.newVolume();
+    final Runnable performCleanup = getCleanupRunnable();
+
+    // when
+    performCleanup.run();
+
+    // then
+    assertThat(client.listVolumesCmd().exec().getVolumes())
+        .as("the volume should be removed")
+        .noneMatch(v -> v.getName().equals(volume.getName()));
+  }
+
+  private Runnable getCleanupRunnable() {
+    return () -> {
+      try {
+        final Class<?> reaperClass =
+            Class.forName("org.testcontainers.utility.JVMHookResourceReaper");
+        Constructor<?> constructor = reaperClass.getDeclaredConstructor();
+        constructor.setAccessible(true);
+        final Object reaper = constructor.newInstance();
+        final Method performCleanup = reaperClass.getDeclaredMethod("performCleanup");
+        performCleanup.setAccessible(true);
+        performCleanup.invoke(reaper);
+      } catch (Exception e) {
+        throw new RuntimeException(e);
+      }
+    };
+  }
+
   private void assertVolumeIsCorrectlyMounted(
       final DockerClient client, final ZeebeVolume volume, final String containerId) {
     final InspectContainerResponse containerResponse =