Add Docker build + Gitea Actions CI for self-hosting

- next.config: output 'standalone' for a self-contained server bundle
- Dockerfile: multi-stage Next.js build (node:22-alpine)
- .gitea/workflows/deploy.yml: build + push to the Gitea registry

Dockerfile

@@ -0,0 +1,30 @@
+# syntax=docker/dockerfile:1
+# Multi-stage build for the Next.js (standalone) itsthevine.com site.
+
+FROM node:22-alpine AS deps
+WORKDIR /app
+COPY package.json package-lock.json ./
+# framer-motion@11 declares a React 18 peer; project is on React 19 (as built on Vercel)
+RUN npm ci --legacy-peer-deps
+
+FROM node:22-alpine AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN npm run build
+
+FROM node:22-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production \
+    NEXT_TELEMETRY_DISABLED=1 \
+    PORT=3000 \
+    HOSTNAME=0.0.0.0
+RUN addgroup -g 1001 -S nodejs && adduser -S nextjs -u 1001
+# standalone output already contains a minimal node_modules + server.js
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+USER nextjs
+EXPOSE 3000
+CMD ["node", "server.js"]