workflows: target-test: use att test docker

Use ATT test docker image.

Signed-off-by: Giacomo Dematteis <giacomo.dematteis@nordicsemi.no>

Author: DematteisGiacomo

.github/workflows/target-test.yml

@@ -55,7 +55,7 @@ jobs:
       packages: read
 
     container:
-      image: ghcr.io/hello-nrfcloud/firmware:docker-v1.0.3
+      image: ghcr.io/nordicsemiconductor/asset-tracker-template:test-docker-v1.0.0
       options: --privileged
       volumes:
         - /dev:/dev:rw

tests/on_target/README.md

@@ -6,15 +6,15 @@ NOTE: The tests have been tested on Ubuntu 22.04. For details on how to install
 
 ### Setup docker
 ```shell
-docker pull ghcr.io/hello-nrfcloud/firmware:docker-v1.0.3
+docker pull ghcr.io/nordicsemiconductor/asset-tracker-template:test-docker-v1.0.0
 cd <path_to_att_dir>
 docker run --rm -it \
   --privileged \
   -v /dev:/dev:rw \
   -v /run/udev:/run/udev \
   -v .:/work/asset-tracker-template \
   -v /opt/setup-jlink:/opt/setup-jlink \
-  ghcr.io/hello-nrfcloud/firmware:docker-v1.0.3 \
+  ghcr.io/nordicsemiconductor/asset-tracker-template:test-docker-v1.0.0 \
   /bin/bash
 cd asset-tracker-template/tests/on_target
 ```