Updated versions and replaced mysql docs with mariadb

Updated Readme to replace the use of mysql with mariadb.
Updated instructions to use boot image builder instead of Jib.
Updated vesions

dataflow-website/batch-developer-guides/batch/batchsamples/pom.xml

@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.2.2.RELEASE</version>
+		<version>2.6.2</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 
@@ -22,7 +22,7 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<java.version>1.8</java.version>
-		<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
+		<spring-cloud.version>2021.0.0</spring-cloud.version>
 		<docker.org>springcloudtask</docker.org>
 		<docker.version>${project.version}</docker.version>
 	</properties>
@@ -85,22 +85,6 @@
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-maven-plugin</artifactId>
 			</plugin>
-			<plugin>
-				<groupId>com.google.cloud.tools</groupId>
-				<artifactId>jib-maven-plugin</artifactId>
-				<version>0.10.1</version>
-				<configuration>
-					<from>
-						<image>springcloud/openjdk</image>
-					</from>
-					<to>
-						<image>${docker.org}/${project.artifactId}:${docker.version}</image>
-					</to>
-					<container>
-						<useCurrentTimestamp>true</useCurrentTimestamp>
-					</container>
-				</configuration>
-			</plugin>
 		</plugins>
 	</build>