feat(gitlab): Initial CI config

Signed-off-by: Valentin Popov <info@valentineus.link>

.gitlab-ci.yml

@@ -0,0 +1,18 @@
+image: "node:latest"
+
+cache:
+  paths:
+    - node_modules/
+
+job-publish:
+  only:
+    - tags
+
+  before_script:
+    - curl -o- -L https://yarnpkg.com/install.sh | bash
+    - export PATH="$HOME/.yarn/bin:$HOME/.config/yarn/global/node_modules/.bin:$PATH
+
+  script:
+    - yarn install
+    - yarn run build
+    - NPM_TOKEN=$(printenv TOKEN) npm publish