Update .gitlab-ci.yml to add a test

Referenced from: https://docs.gitlab.com/ee/user/packages/container_registry/

.gitlab-ci.yml

@@ -1,28 +1,34 @@
-# This file is a template, and might need editing before it works on your project.
-docker-build-master:
-  # Official docker image.
-  image: docker:latest
-  stage: build
+image: docker:19.03.8
 services:
-    - docker:dind
+  - docker:19.03.8-dind
+
+stages:
+  - build
+  - test
+  - release
+
+variables:
+  CONTAINER_TEST_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+  CONTAINER_RELEASE_IMAGE: $CI_REGISTRY_IMAGE:latest
+
 before_script:
-    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+  - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+
+build:
+  stage: build
   script:
-    - docker build --pull -t "$CI_REGISTRY_IMAGE" .
-    - docker push "$CI_REGISTRY_IMAGE"
+    - docker build --pull -t $CONTAINER_TEST_IMAGE .
+    - docker push $CONTAINER_TEST_IMAGE
+
+test-gcc-version:
+  stage: test
+  script:
+    - docker pull $CONTAINER_TEST_IMAGE
+    - docker run $CONTAINER_TEST_IMAGE "arm-none-eabi-gcc -v"
+
+deploy:
+  stage: deploy
+  script:
+    - ./deploy.sh
   only:
     - master
-
-docker-build:
-  # Official docker image.
-  image: docker:latest
-  stage: build
-  services:
-    - docker:dind
-  before_script:
-    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
-  script:
-    - docker build --pull -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG" .
-    - docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG"
-  except:
-    - master