add gitlab-ci

.gitlab-ci.yml

+image: node:18.16.0-alpine # change to match your project's node version
+
+build:
+  stage: build
+  tags:
+    - strikingly
+  cache:
+    paths:
+      - node_modules/
+  script:
+    - CI=false npm install
+    - CI=false npm run build
+  artifacts:
+    paths:
+      - build
+
+pages:
+  stage: deploy
+  tags:
+    - strikingly
+  dependencies: 
+    - build
+  script:
+    - rm -rf public
+    - cp build/index.html build/404.html
+    - mv build public
+  artifacts:
+    paths:
+      - public
+  only:
+    - master
\ No newline at end of file