Add GitLab CI/CD pipeline for build and deploy

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitlab-ci.yml

@@ -0,0 +1,34 @@
+stages:
+  - build
+  - deploy
+
+build:
+  stage: build
+  image: node:20-alpine
+  script:
+    - npm ci
+    - npm run build
+  artifacts:
+    paths:
+      - dist/
+    expire_in: 1 hour
+  only:
+    - main
+
+deploy:
+  stage: deploy
+  image: alpine:latest
+  before_script:
+    - apk add --no-cache rsync openssh-client
+    - eval $(ssh-agent -s)
+    - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
+    - mkdir -p ~/.ssh && chmod 700 ~/.ssh
+    - echo "$SSH_KNOWN_HOSTS" > ~/.ssh/known_hosts
+    - chmod 644 ~/.ssh/known_hosts
+  script:
+    - rsync -avz --delete dist/ $DEPLOY_USER@$DEPLOY_HOST:/var/www/domains/gateway-gamers.net/kingmaker/
+  only:
+    - main
+  environment:
+    name: production
+    url: https://kingmaker.gateway-gamers.net