Add Docker deployment and Gitea Actions CI/CD

Dockerfile

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+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files
+COPY package.json package-lock.json ./
+RUN npm ci --ignore-scripts
+
+# Copy source code
+COPY . .
+
+# Build the application
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN npm run build
+
+
+# Production stage
+FROM node:20-alpine AS runner
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+# Create non-root user
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# Copy built application
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV HOSTNAME=0.0.0.0
+
+ENV PORT=3000
+
+CMD ["node", "server.js"]