feat: add standard org.testcontainers=true label

testcontainers/src/core/containers/request.rs

@@ -269,7 +269,15 @@ impl<I: Image> From<I> for ContainerRequest<I> {
             platform: None,
             network: None,
             hostname: None,
-            labels: BTreeMap::default(),
+            labels: {
+                let mut l = BTreeMap::new();
+                l.insert("org.testcontainers".to_string(), "true".to_string());
+                l.insert(
+                    "org.testcontainers.managed-by".to_string(),
+                    "testcontainers".to_string(),
+                );
+                l
+            },
             env_vars: BTreeMap::default(),
             hosts: BTreeMap::default(),
             mounts: Vec::new(),

testcontainers/src/runners/async_runner.rs

@@ -528,6 +528,7 @@ mod tests {
             "testcontainers".to_string(),
         );
 
+        labels.insert("org.testcontainers".to_string(), "true".to_string());
         #[cfg(feature = "reusable-containers")]
         labels.extend([(
             "org.testcontainers.session-id".to_string(),