Add tests for docker image

.gitlab-ci.yml

@@ -4,7 +4,7 @@ image: docker:latest
 # improved performance.
 variables:
   DOCKER_DRIVER: overlay
-  IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+  IMAGE_NAME: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
   IMAGE_LATEST: $CI_REGISTRY_IMAGE:latest
 
 services:
@@ -12,6 +12,8 @@ services:
 
 stages:
   - build
+  - test
+  - cleanup
   - deploy
 
 before_script:
@@ -21,13 +23,20 @@ before_script:
 build:
   stage: build
   script:
-    - docker build -t $IMAGE_TAG .
+    - docker build -t $IMAGE_NAME .
+    - docker push $IMAGE_NAME
+
+test:
+  stage: test
+  script:
+    - docker pull $IMAGE_NAME
+    - docker run -v `pwd`:/git $IMAGE_NAME /bin/sh -c "wget -qO- https://fedoraproject.org/static/hotspot.txt | grep OK && cd /git && hugo"
 
 deploy:
   stage: deploy
   script:
-    - docker build -t $IMAGE_TAG -t $IMAGE_LATEST .
-    - docker push $CI_REGISTRY_IMAGE
+    - docker pull $IMAGE_NAME
+    - docker tag $IMAGE_NAME $IMAGE_LATEST
+    - docker push $IMAGE_LATEST
   only:
     - tags
-