feat: Add Gitea Actions pipeline and Docker deployment config

Dockerfile

@@ -0,0 +1,30 @@
+# Stage 1: Build the React application
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY . .
+
+# Build arguments for Vite environment variables
+ARG VITE_SUPABASE_URL
+ARG VITE_SUPABASE_ANON_KEY
+ARG GEMINI_API_KEY
+
+ENV VITE_SUPABASE_URL=$VITE_SUPABASE_URL
+ENV VITE_SUPABASE_ANON_KEY=$VITE_SUPABASE_ANON_KEY
+ENV GEMINI_API_KEY=$GEMINI_API_KEY
+
+RUN npm run build
+
+# Stage 2: Serve with Nginx
+FROM nginx:alpine
+
+COPY --from=builder /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]