Executor Container needs to be started with `--detach`

[mbfm]

In principle, we want roughly this change to be made:

                let engine = match engine {
                    Engine::Docker => { "docker" }
                    Engine::Podman => { "podman" }
                };
                let mut cmd = Command::new(engine);
                cmd.arg("run");
+               cmd.arg("--detach");
                cmd.arg("--restart=unless-stopped");
                if let ContainerName::Value(name) = name {
                    cmd.args(["--name", name.as_str()]);
                }
                for port in ports {
                    cmd.args(["--publish", port.value()]);
                }
                for volume in volumes {
                    cmd.args(["--volume", volume.value()]);
                }
                for device in devices {
                    cmd.args(["--devices", device.value()]);
                }
                for env in envs {
                    cmd.args(["--env", &format!("{}={}", env.name(), env.value())]);
                }
                cmd.arg(image.value());
                if let ContainerCommand::Value(command) = command {
                    cmd.arg(command.as_str());
                }
                for arg in args {
                    cmd.arg(arg.value());
                }
                debug!("Command: {:?}", cmd);
-               match cmd.spawn() {
+               match cmd.output().await {
                    Ok(_) => { info!("Container started.") }
                    Err(_) => { error!("Failed to start container.") }
                };

The change needs to be made here:
https://github.com/eclipse-opendut/opendut/blob/b97b3f5a4e711857beb56d30441defecccb00d58/opendut-edgar/src/service/start.rs#L205-L238

However, this needs to be tested. We should also take the command output and include it into the log statement after the command was started.