Add lang and version labels to containers (#6124)

The following labels are added `org.testcontainers.lang` and
`org.testcontainers.version`. Those are good identifiers when debugging
and sharing logs.

Co-authored-by: Sergei Egorov <bsideup@gmail.com>

Author: eddumelendez

core/build.gradle

@@ -10,6 +10,12 @@ test.maxParallelForks = 4
 
 idea.module.testSourceDirs += sourceSets.jarFileTest.allSource.srcDirs
 
+jar {
+    manifest {
+        attributes('Implementation-Version': project.getProperty("version"))
+    }
+}
+
 shadowJar {
     [
         'META-INF/NOTICE',

core/src/main/java/org/testcontainers/DockerClientFactory.java

@@ -13,7 +13,6 @@
 import com.github.dockerjava.api.model.Version;
 import com.github.dockerjava.api.model.Volume;
 import com.google.common.annotations.VisibleForTesting;
-import com.google.common.collect.ImmutableMap;
 import lombok.Getter;
 import lombok.SneakyThrows;
 import lombok.Synchronized;
@@ -34,6 +33,7 @@
 import java.io.InputStream;
 import java.net.URI;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -56,9 +56,24 @@ public class DockerClientFactory {
 
     public static final String TESTCONTAINERS_SESSION_ID_LABEL = TESTCONTAINERS_LABEL + ".sessionId";
 
+    public static final String TESTCONTAINERS_LANG_LABEL = TESTCONTAINERS_LABEL + ".lang";
+
+    public static final String TESTCONTAINERS_VERSION_LABEL = TESTCONTAINERS_LABEL + ".version";
+
     public static final String SESSION_ID = UUID.randomUUID().toString();
 
-    public static final Map<String, String> DEFAULT_LABELS = ImmutableMap.of(TESTCONTAINERS_LABEL, "true");
+    public static final Map<String, String> DEFAULT_LABELS = markerLabels();
+
+    static Map<String, String> markerLabels() {
+        String implementationVersion = DockerClientFactory.class.getPackage().getImplementationVersion();
+        String testcontainersVersion = implementationVersion == null ? "unspecified" : implementationVersion;
+
+        Map<String, String> labels = new HashMap<>();
+        labels.put(TESTCONTAINERS_LABEL, "true");
+        labels.put(TESTCONTAINERS_LANG_LABEL, "java");
+        labels.put(TESTCONTAINERS_VERSION_LABEL, testcontainersVersion);
+        return Collections.unmodifiableMap(labels);
+    }
 
     private static final DockerImageName TINY_IMAGE = DockerImageName.parse("alpine:3.16");
 

core/src/test/java/org/testcontainers/junit/GenericContainerRuleTest.java

@@ -269,6 +269,13 @@ public void customLabelTest() {
 
             Map<String, String> labels = alpineCustomLabel.getCurrentContainerInfo().getConfig().getLabels();
             assertThat(labels).as("org.testcontainers label is present").containsKey("org.testcontainers");
+            assertThat(labels).as("org.testcontainers.lang label is present").containsKey("org.testcontainers.lang");
+            assertThat(labels)
+                .as("org.testcontainers.lang label is present")
+                .containsEntry("org.testcontainers.lang", "java");
+            assertThat(labels)
+                .as("org.testcontainers.version label is present")
+                .containsKey("org.testcontainers.version");
             assertThat(labels).as("our.custom label is present").containsKey("our.custom");
             assertThat(labels).as("our.custom label value is label").containsEntry("our.custom", "label");
         }