Improve logging in InternalCommandPortListeningCheck (#3001)

Author: vcvitaly

core/src/main/java/org/testcontainers/containers/wait/internal/InternalCommandPortListeningCheck.java

@@ -41,7 +41,11 @@ public Boolean call() {
         try {
             ExecResult result = ExecInContainerPattern.execInContainer(waitStrategyTarget.getContainerInfo(), "/bin/sh", "-c", command.toString());
             log.trace("Check for {} took {}. Result code '{}', stdout message: '{}'", internalPorts, Duration.between(before, Instant.now()), result.getExitCode(), result.getStdout());
-            return result.getExitCode() == 0;
+            int exitCode = result.getExitCode();
+            if (exitCode != 0 && exitCode != 1) {
+                log.warn("An exception while executing the internal check: {}", result);
+            }
+            return exitCode == 0;
         } catch (Exception e) {
             throw new IllegalStateException(e);
         }