Use GitLab CI environments for Surge

Learn more: https://docs.gitlab.com/ee/ci/environments.html

.gitlab-ci.yml

@@ -69,9 +69,32 @@ deploy-surge:
   only:
     - merge_requests
 
+  environment:
+    name: ${CI_COMMIT_REF_SLUG}
+    url: https://${CI_COMMIT_REF_SLUG}-teklia.surge.sh
+    on_stop: stop-surge
+
+  before_script:
+    - npm install -g surge
+
+  script:
+    - surge dist ${CI_ENVIRONMENT_URL}
+
+stop-surge:
+  stage: deploy
+  when: manual
+
+  # Do not try to checkout the branch if it was deleted
+  variables:
+    GIT_STRATEGY: none
+
+  environment:
+    name: ${CI_COMMIT_REF_SLUG}
+    url: https://${CI_COMMIT_REF_SLUG}-teklia.surge.sh
+    action: stop
+
   before_script:
     - npm install -g surge
 
   script:
-    - SLUG=$(echo ${CI_BUILD_REF_NAME} | sed 's/[^a-zA-Z0-9\-_]/-/g ; s/-\+/-/g')
-    - surge dist ${SLUG}-teklia.surge.sh
+    - surge teardown ${CI_ENVIRONMENT_URL}