Added CI script

.gitlab-ci.yml

+stages:
+  - build
+
+
+pages:
+  stage: build
+  image: funkwhale/front-base
+  variables:
+    GIT_STRATEGY: clone
+  before_script:
+    - yarn install
+  script:
+    - yarn lint
+    - yarn i18n-compile
+    - yarn build
+    - rm -rf public
+    - mv dist public
+    # ugly hack from https://gitlab.com/gitlab-org/gitlab-pages/issues/23#note_57499396
+    # until Gitlab Pages has better support for SPA
+    - cp public/index.html public/404.html
+  cache:
+    key: front_node_modules
+    paths:
+      - "node_modules"
+  artifacts:
+    paths:
+      - public/
+  only:
+    - master@funkwhale/funkwhale.audio
+  tags:
+    - docker