Merge pull request #274 from testcontainers/fix-dockerfile-resource-leak

Ensure that piped streams are closed automatically

core/src/main/java/org/testcontainers/images/builder/ImageFromDockerfile.java

@@ -6,6 +6,7 @@
 import com.github.dockerjava.api.model.BuildResponseItem;
 import com.github.dockerjava.core.command.BuildImageResultCallback;
 import com.google.common.collect.Sets;
+import lombok.Cleanup;
 import lombok.Getter;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
@@ -113,8 +114,8 @@ public void onNext(BuildResponseItem item) {
             };
 
             // We have to use pipes to avoid high memory consumption since users might want to build really big images
-            PipedInputStream in = new PipedInputStream();
-            PipedOutputStream out = new PipedOutputStream(in);
+            @Cleanup PipedInputStream in = new PipedInputStream();
+            @Cleanup PipedOutputStream out = new PipedOutputStream(in);
 
             profiler.start("Configure image");
             BuildImageCmd buildImageCmd = dockerClient.buildImageCmd(in);