Quarkus build docker images should emit warning when pom.xml have no "Container Image extensions"

[kafeltz]

Description

When doing ./mvnw clean package it does not emit any warning/error trying to create a docker image and/or pushing it.

It took me some hours to find out that I must put an Container Image extensions like this one:

<dependency>
    <groupId>io.quarkus</groupId>
    <artifactId>quarkus-container-image-docker</artifactId>
</dependency>

I know that info is writting in the guide: https://quarkus.pro/guides/container-image.html but would be nice an warning instead of "nothing" because I forgot that part and this would save people wasting time figuring this out.

Thx

[geoand]

@radcortez I wonder if we should also be emitting a warning at build time if a config property does not map to Quarkus Config object

[radcortez]

We should be able to do it for build time as well.