Building docker image with spring boot 2.4.1 failes with "Missing 'io.buildpacks.stack.id' stack label" when behind a firewall - spring

Question

I'm, trying to build a docker image with ./mvnw -DskipTests spring-boot:build-image using spring boot 2.4.1 and java 11 (openjdk version "11.0.9" 2020-10-20 LTS) on RHEL7.
I do this on a host behind a strict firewall so I have to fetch the build- and runimage from a private repo. I have configured the spring-boot-maven-plugin to use this repo:
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<docker>
<builderRegistry>
<username>my-username</username>
<password>xxx</password>
<url>https://my-mirror.com</url>
<email>kaj.hejer#usit.uio.no</email>
</builderRegistry>
</docker>
<image>
<builder>my-mirror.com/library/docker.io-paketobuildpacks-builder:base</builder>
<runImage>my-mirror.com/library/docker.io-paketobuildpacks-run:base</runImage>
<name>my-mirror.com/my-group/my-app:latest</name>
<verboseLogging>true</verboseLogging>
</image>
</configuration>
</plugin>
The build fails with
[INFO] > Pulling builder image 'my-mirror.com/library/docker.io-paketobuildpacks-builder:base' 100%
[INFO] > Pulled builder image 'my-mirror.com/library/docker.io-paketobuildpacks-builder#sha256:cf90221a33966e42f8b1960123dea4406c65fc6a410142ded573ed850ccc313b'
[INFO] > Pulling run image 'my-mirror.com/library/docker.io-paketobuildpacks-run:base' 100%
[INFO] > Pulled run image 'my-mirror.com/library/docker.io-paketobuildpacks-run#sha256:56fb7587103da155db6d4f9434fd7e2f9e45d7540a062847fd84e9132a28101b'
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.090 s
[INFO] Finished at: 2020-12-17T08:36:48+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.4.1:build-image (default-cli) on project my-app: Execution default-cli of goal org.springframework.boot:spring-boot-maven-plugin:2.4.1:build-image failed: Missing 'io.buildpacks.stack.id' stack label -> [Help 1]
[ERROR]
When I try to build a docker image the same way but without the configuration block for the spring-boot-maven-plugin on my mac which is not behind a firewall it works just fine.
Can it be SELinux releated in some way? sudo journalctl -f don't list anything when running the mvnw command.
Thanks in advance for any input or ideas!
-Kaj :)

Answer 1

On https://github.com/spring-projects/spring-boot/issues/24641 we found that I used the tag base instead of base-cnb. With tag base-cnb it worked fine.
Now I got a [creator] ERROR: failed to initialize docker client: failed to connect to docker socket: dial unix /var/run/docker.sock: connect: permission denied but that is not related to this question.