[cloud-kotlin-jib-cloud-run]: issue with Gradle and Maven

[CrlsMrls]

Step 3. Initialize a Spring Boot app has an issue when the user is asked to generate a new Spring Boot app with Spring Initializr.

The command ./mvnw -DskipTests spring-boot:run fails because the Spring Initializr was not downloaded for maven, instead with the default Gradle support.

In order to fix it, add the property -d type=maven-project, so it should be:

 $ curl https://start.spring.io/starter.tgz \
   -d language=kotlin \
   -d dependencies=web \
   -d type=maven-project \
   -d baseDir=kotlin-jib-cloud-run | tar -xzvf -

instead of

 $ curl https://start.spring.io/starter.tgz \
   -d language=kotlin \
   -d dependencies=web \
   -d baseDir=kotlin-jib-cloud-run | tar -xzvf -