Upload dockerfile e dockerignore backend

frontend/.dockerignore

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+node_modules
+dist
+.env
+*.log

frontend/Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+
+EXPOSE 3000
+
+CMD ["npm", "run", "dev", "--", "--host", "0.0.0.0", "--port", "3000"]