Add GitHub Actions workflow for Docker image builds

- Build and push to GHCR on every push to main
- Multi-platform support (amd64, arm64)
- Root-level docker-compose.yml using pre-built image
- Users can now deploy without cloning repo

.github/workflows/docker.yml

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+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - main
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix=,suffix=,format=short
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./docker/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v1
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true

docker-compose.yml

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+# Synapsis - Docker Compose
+# One-command deployment: docker-compose up -d
+# 
+# Uses pre-built image from GitHub Container Registry
+# Users just download this file + Caddyfile + .env, no git clone needed
+#
+# Services:
+# - Synapsis Next.js application (pre-built image)
+# - PostgreSQL database (persistent storage)
+# - Caddy reverse proxy with automatic SSL
+
+version: "3.8"
+
+services:
+  # ============================================
+  # PostgreSQL Database
+  # ============================================
+  postgres:
+    image: postgres:16-alpine
+    container_name: synapsis-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: ${DB_USER:-synapsis}
+      POSTGRES_PASSWORD: ${DB_PASSWORD:-changeme}
+      POSTGRES_DB: ${DB_NAME:-synapsis}
+      PGDATA: /var/lib/postgresql/data/pgdata
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    networks:
+      - synapsis-network
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${DB_USER:-synapsis} -d ${DB_NAME:-synapsis}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # ============================================
+  # Synapsis Application (Pre-built Image)
+  # ============================================
+  app:
+    image: ghcr.io/cyph3rasi/synapsis:latest
+    container_name: synapsis-app
+    restart: unless-stopped
+    environment:
+      DATABASE_URL: postgresql://${DB_USER:-synapsis}:${DB_PASSWORD:-changeme}@postgres:5432/${DB_NAME:-synapsis}
+      AUTH_SECRET: ${AUTH_SECRET}
+      NEXT_PUBLIC_NODE_DOMAIN: ${DOMAIN:-localhost}
+      ADMIN_EMAILS: ${ADMIN_EMAILS}
+      STORAGE_ENDPOINT: ${STORAGE_ENDPOINT}
+      STORAGE_REGION: ${STORAGE_REGION:-us-east-1}
+      STORAGE_BUCKET: ${STORAGE_BUCKET}
+      STORAGE_ACCESS_KEY: ${STORAGE_ACCESS_KEY}
+      STORAGE_SECRET_KEY: ${STORAGE_SECRET_KEY}
+      STORAGE_PUBLIC_BASE_URL: ${STORAGE_PUBLIC_BASE_URL}
+      BOT_MAX_PER_USER: ${BOT_MAX_PER_USER:-5}
+      NODE_ENV: production
+    volumes:
+      - uploads_data:/app/uploads
+    networks:
+      - synapsis-network
+    depends_on:
+      postgres:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "wget", "-q", "--spider", "http://localhost:3000/api/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+
+  # ============================================
+  # Caddy Reverse Proxy (Automatic SSL)
+  # ============================================
+  caddy:
+    image: caddy:2-alpine
+    container_name: synapsis-caddy
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./Caddyfile:/etc/caddy/Caddyfile:ro
+      - caddy_data:/data
+      - caddy_config:/config
+    networks:
+      - synapsis-network
+    depends_on:
+      app:
+        condition: service_healthy
+    environment:
+      - DOMAIN=${DOMAIN:-localhost}
+
+# ============================================
+# Persistent Volumes
+# ============================================
+volumes:
+  postgres_data:
+    driver: local
+  uploads_data:
+    driver: local
+  caddy_data:
+    driver: local
+  caddy_config:
+    driver: local
+
+# ============================================
+# Networks
+# ============================================
+networks:
+  synapsis-network:
+    driver: bridge