Fix wait strategy definition (#8842)

Currently, `waitingFor` takes precedence over `setWaitStrategy`. This was introduced with
 ContainerDef in 1dba8d1. This commit  uses `waitStrategy` defined in GenericContainer for both
methods `waitingFor` and `setWaitStrategy`.

Fixes #8578

Author: eddumelendez

core/src/main/java/org/testcontainers/containers/GenericContainer.java

@@ -893,7 +893,7 @@ protected WaitStrategy getWaitStrategy() {
 
     @Override
     public void setWaitStrategy(WaitStrategy waitStrategy) {
-        this.containerDef.setWaitStrategy(waitStrategy);
+        this.waitStrategy = waitStrategy;
     }
 
     /**

core/src/test/java/org/testcontainers/containers/GenericContainerTest.java

@@ -20,6 +20,8 @@
 import org.testcontainers.TestImages;
 import org.testcontainers.containers.startupcheck.StartupCheckStrategy;
 import org.testcontainers.containers.wait.strategy.AbstractWaitStrategy;
+import org.testcontainers.containers.wait.strategy.LogMessageWaitStrategy;
+import org.testcontainers.containers.wait.strategy.Wait;
 import org.testcontainers.images.RemoteDockerImage;
 import org.testcontainers.images.builder.ImageFromDockerfile;
 import org.testcontainers.images.builder.Transferable;
@@ -256,6 +258,21 @@ public void shouldContainDefaultNetworkAliasWhenUsingContainerDef() {
         }
     }
 
+    @Test
+    public void shouldRespectWaitStrategy() {
+        try (
+            HelloWorldLogStrategyContainer container = new HelloWorldLogStrategyContainer(
+                "testcontainers/helloworld:1.1.0"
+            )
+        ) {
+            container.setWaitStrategy(Wait.forLogMessage(".*Starting server on port.*", 1));
+            container.start();
+            assertThat((LogMessageWaitStrategy) container.getWaitStrategy())
+                .extracting("regEx", "times")
+                .containsExactly(".*Starting server on port.*", 1);
+        }
+    }
+
     static class NoopStartupCheckStrategy extends StartupCheckStrategy {
 
         @Override
@@ -319,4 +336,13 @@ class HelloWorldContainerDef extends ContainerDef {
             }
         }
     }
+
+    static class HelloWorldLogStrategyContainer extends GenericContainer<HelloWorldContainer> {
+
+        public HelloWorldLogStrategyContainer(String image) {
+            super(DockerImageName.parse(image));
+            withExposedPorts(8080);
+            waitingFor(Wait.forLogMessage(".*Starting server on port.*", 2));
+        }
+    }
 }