ci: Add GitLab CI/CD pipeline for automated Docker deployment

Added CI/CD pipeline with:
- Build stage: Creates Docker image from website files
- Deploy stage: Deploys to production server (PORTAINER-01)
- Automatic deployment on master/main branch
- Container runs on port 8100 mapped to internal port 80
- Available at https://silverlabs.uk

Pipeline deploys to:
- Server: 10.0.0.51 (PORTAINER-01)
- Port: 8100
- Docker container: silverlabs-website

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.gitlab-ci.yml

@@ -0,0 +1,74 @@
+stages:
+  - build
+  - deploy
+
+variables:
+  DOCKER_IMAGE: silverlabs-website
+
+# Use Docker image
+image: docker:latest
+
+# Build Docker image
+build:website:
+  stage: build
+  services:
+    - docker:dind
+  script:
+    - echo "Building SilverLabs Website Docker image..."
+    - docker build -t $DOCKER_IMAGE:latest -t $DOCKER_IMAGE:${CI_COMMIT_SHORT_SHA} .
+    - docker images
+  tags:
+    - docker
+  only:
+    - master
+    - main
+
+# Deploy to production server (PORTAINER-01)
+deploy:production:
+  stage: deploy
+  image: docker:latest
+  services:
+    - docker:dind
+  dependencies:
+    - build:website
+  before_script:
+    - apk add --no-cache sshpass openssh-client
+  script:
+    - echo "🚀 Deploying SilverLabs Website to silverlabs.uk (PORTAINER-01)"
+
+    # Build Docker image
+    - docker build -t $DOCKER_IMAGE:latest -t $DOCKER_IMAGE:${CI_COMMIT_SHORT_SHA} .
+
+    # Save and transfer image to server
+    - docker save $DOCKER_IMAGE:latest | gzip > /tmp/$DOCKER_IMAGE-image.tar.gz
+    - sshpass -p "Phenom12#." scp -o StrictHostKeyChecking=no /tmp/$DOCKER_IMAGE-image.tar.gz sysadmin@10.0.0.51:/tmp/
+
+    # Deploy on server
+    - |
+      sshpass -p "Phenom12#." ssh -o StrictHostKeyChecking=no sysadmin@10.0.0.51 << 'ENDSSH'
+      cd /opt/silverlabs/website
+      docker load < /tmp/$DOCKER_IMAGE-image.tar.gz
+
+      # Stop and remove old container
+      docker stop silverlabs-website 2>/dev/null || true
+      docker rm silverlabs-website 2>/dev/null || true
+
+      # Start new container
+      docker run -d \
+        --name silverlabs-website \
+        --restart unless-stopped \
+        -p 8100:80 \
+        silverlabs-website:latest
+
+      docker ps | grep silverlabs-website
+      rm /tmp/silverlabs-website-image.tar.gz
+      echo "✅ Deployment complete!"
+      ENDSSH
+  environment:
+    name: production
+    url: https://silverlabs.uk
+  only:
+    - master
+    - main
+  tags:
+    - docker