Set up pages hosting.

.gitlab-ci.yml

@@ -9,3 +9,13 @@ cargo-test:
     - rustc -V
   script:
     - cargo test
+
+pages:
+  image: alpine:latest
+  script:
+    - echo "noop"
+  artifacts:
+    paths:
+      - public
+  only:
+    - master