Get region from env variables or default

modules/localstack/src/main/java/org/testcontainers/containers/localstack/LocalStackContainer.java

@@ -45,9 +45,12 @@ public class LocalStackContainer extends GenericContainer<LocalStackContainer> {
 
     private static final String DEFAULT_TAG = "0.11.2";
 
+    private static final String DEFAULT_REGION = "us-east-1";
+
     @Deprecated
     public static final String VERSION = DEFAULT_TAG;
 
+
     /**
      * Whether or to assume that all APIs run on different ports (when <code>true</code>) or are
      * exposed on a single port (<code>false</code>). From the Localstack README:
@@ -311,7 +314,7 @@ public String getSecretKey() {
      * @return a default region
      */
     public String getRegion() {
-        return "us-east-1";
+        return this.getEnvMap().getOrDefault("DEFAULT_REGION", DEFAULT_REGION);
     }
 
     public interface EnabledService {

modules/localstack/src/test/java/org/testcontainers/containers/localstack/LocalstackContainerTest.java

@@ -286,4 +286,22 @@ private String runAwsCliAgainstDockerNetworkContainer(String command) throws Exc
             return logs;
         }
     }
+
+    public static class WithRegion {
+
+        // with_region {
+        private static String region = "eu-west-1";
+        @ClassRule
+        public static LocalStackContainer localstack = new LocalStackContainer(LOCALSTACK_IMAGE)
+            .withEnv("DEFAULT_REGION", region)
+            .withServices(S3);
+        // }
+
+        @Test
+        public void s3EndpointHasProperRegion() throws IOException {
+            final AwsClientBuilder.EndpointConfiguration endpointConfiguration = localstack.getEndpointConfiguration(S3);
+            assertEquals("The endpoint configuration has right region", region, endpointConfiguration.getSigningRegion());
+
+        }
+    }
 }