Build in docker: can't find connection!

[danergo]

Describe the bug
Building in docker is NOT working!

Unable to find Docker connection:example/example_build:0.1

To Reproduce
Created and run a docker image with

docker run -it --name=example --mount type=bind,source=${PWD},target=/src example/example_build:0.1 bash

Expected behavior
Build in docker works.

Screenshots

Please see, "My docker" is my local instance of docker. Also, please see "example" is in running stage.

In project's properties, I ticked "Build inside Docker image":

However, when I try building, I got an error:
Unable to find Docker connection:example/example_build:0.1

Version Information (please complete the following information):

• Ubuntu 24.04LTS
• Eclipse Version: 2024-12 (4.34.0)
• CDT Version: 11.6.1.202407022008

[danergo]

Unable to find Docker connection:{0}

Is showing up in
./launch/org.eclipse.cdt.docker.launcher/src/org/eclipse/cdt/internal/docker/launcher/messages.properties for the ContainerCommandLauncher_pullerr_noConn constant.

ContainerCommandLauncher_pullerr_noConn:
Only in one single place this is used:
./launch/org.eclipse.cdt.docker.launcher/src/org/eclipse/cdt/internal/docker/launcher/ContainerLaunchUtils.java:

    /**
     * Pull an Docker-Image if is not locally available.
     *
     * @param monitor A Monitor to show progress
     * @param connectionName The name of the connection
     * @param imageName The image to pull
     * @return Status.OK on success, Status.CANCEL_STATUS if cancelled, and Status.ERROR if an error occurs
     *
     */
    public static @NonNull IStatus provideDockerImage(IProgressMonitor monitor, @NonNull final String connectionName,
            @NonNull String imageName) {

        // Try to pull image, if necessary
        final var connection = (IDockerConnection4) DockerConnectionManager.getInstance()
                .getConnectionByName(connectionName);

        if (connection == null) {
            // This is unlikely to happen, but who knows
            return new Status(Status.ERROR, DockerLaunchUIPlugin.PLUGIN_ID,
                    NLS.bind(Messages.ContainerCommandLauncher_pullerr_noConn, imageName, connectionName));
        }
...

This is unlikely to happen, but who knows

Who knows? :)