Add default labels to images created with ImageFromDockerfile (#2809)

Author: bsideup

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

@@ -107,6 +107,12 @@ public void onNext(BuildResponseItem item) {
 
             BuildImageCmd buildImageCmd = dockerClient.buildImageCmd(in);
             configure(buildImageCmd);
+            Map<String, String> labels = new HashMap<>();
+            if (buildImageCmd.getLabels() != null) {
+                labels.putAll(buildImageCmd.getLabels());
+            }
+            labels.putAll(DockerClientFactory.DEFAULT_LABELS);
+            buildImageCmd.withLabels(labels);
 
             prePullDependencyImages(dependencyImageNames);
 

core/src/test/java/org/testcontainers/images/builder/ImageFromDockerfileTest.java

@@ -0,0 +1,27 @@
+package org.testcontainers.images.builder;
+
+import com.github.dockerjava.api.DockerClient;
+import com.github.dockerjava.api.command.InspectImageResponse;
+import org.junit.Test;
+import org.testcontainers.DockerClientFactory;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class ImageFromDockerfileTest {
+
+    @Test
+    public void shouldAddDefaultLabels() {
+        ImageFromDockerfile image = new ImageFromDockerfile()
+            .withDockerfileFromBuilder(it -> it.from("scratch"));
+
+        String imageId = image.resolve();
+
+        DockerClient dockerClient = DockerClientFactory.instance().client();
+
+        InspectImageResponse inspectImageResponse = dockerClient.inspectImageCmd(imageId).exec();
+
+        assertThat(inspectImageResponse.getConfig().getLabels())
+            .containsAllEntriesOf(DockerClientFactory.DEFAULT_LABELS);
+    }
+
+}