Support ability to run in development mode with postgresql for batch sample.

spring-cloud-task-samples/batch-job/README.adoc

@@ -38,3 +38,9 @@ mvn -Pnative native:compile
 ----
 ./target/batch-job
 ----
+
+== Run the application with a Postgesql test container
+[source,shell]
+----
+./mvnw spring-boot:test-run
+----

spring-cloud-task-samples/batch-job/pom.xml

@@ -57,6 +57,20 @@
 			<groupId>org.mariadb.jdbc</groupId>
 			<artifactId>mariadb-java-client</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.testcontainers</groupId>
+			<artifactId>postgresql</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-testcontainers</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.postgresql</groupId>
+			<artifactId>postgresql</artifactId>
+		</dependency>
 	</dependencies>
 
 	<repositories>

spring-cloud-task-samples/batch-job/src/test/java/io/spring/BatchJobTestConfiguration.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.spring;
+
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.boot.testcontainers.service.connection.ServiceConnection;
+import org.springframework.context.annotation.Bean;
+import org.testcontainers.containers.PostgreSQLContainer;
+import org.testcontainers.utility.DockerImageName;
+
+@TestConfiguration(proxyBeanMethods = false)
+class BatchJobTestConfiguration {
+
+	@Bean
+	@ServiceConnection
+	public PostgreSQLContainer<?> postgresSQLContainer() {
+		return new PostgreSQLContainer(DockerImageName.parse("postgres:15.1"));
+	}
+}

spring-cloud-task-samples/batch-job/src/test/java/io/spring/TestBatchJobApp.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.spring;
+
+import org.springframework.boot.SpringApplication;
+
+public class TestBatchJobApp {
+
+	public static void main(String[] args) {
+		String[] myArgs = {"--spring.batch.jdbc.initialize-schema=always"};
+		SpringApplication.from(BatchJobApplication::main).
+			with(BatchJobTestConfiguration.class).
+			run(myArgs);
+	}
+}