Update IAR docker image name

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: Ia1df559b8e58c1159c2419bc40746cbebf2ca813
diff --git a/docker_templates_amd64.yml b/docker_templates_amd64.yml
index 9f362dc..5c375d0 100644
--- a/docker_templates_amd64.yml
+++ b/docker_templates_amd64.yml
@@ -38,7 +38,7 @@
       - PLANTUML_JAR_PATH : '/usr/share/plantuml/plantuml.jar'
 
 - docker-amd64-tf-m-jammy-iar:
-  docker_image_name: 'ci-amd64-tf-m-ubuntu:jammy-iar'
+  docker_image_name: 'ci-amd64-tf-m-iar-ubuntu:jammy-iar'
   labels: 'docker-amd64-tf-m-jammy-iar'
   launch_method: 'launch_ssh'
   ssh: !include docker_ssh_buildslave.yml