feat(docker): add Dockerfiles for services

src/http-proxy-service/Dockerfile

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+FROM golang:1.21-alpine
+
+WORKDIR /app
+COPY ./src/http-proxy-service ./src/http-proxy-service
+
+WORKDIR /app/src/http-proxy-service
+RUN go build -o ./main
+
+EXPOSE 8080
+CMD ["/app/src/http-proxy-service/main"]

src/product-service/Dockerfile

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+FROM golang:1.21-alpine
+
+WORKDIR /app
+COPY ./lib ./lib
+COPY ./src/product-service ./src/product-service
+
+WORKDIR /app/src/product-service
+RUN go mod tidy
+RUN go build -o ./main
+
+EXPOSE 3003
+CMD ["/app/src/product-service/main"]

src/shoppinglist-service/Dockerfile

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+FROM golang:1.21-alpine
+
+WORKDIR /app
+COPY ./lib ./lib
+COPY ./src/shoppinglist-service ./src/shoppinglist-service
+
+WORKDIR /app/src/shoppinglist-service
+RUN go mod tidy
+RUN go build -o ./main
+
+EXPOSE 3002
+CMD ["/app/src/shoppinglist-service/main"]

src/user-service/Dockerfile

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+FROM golang:1.21-alpine
+
+WORKDIR /app
+COPY ./lib ./lib
+COPY ./src/user-service ./src/user-service
+
+WORKDIR /app/src/user-service
+RUN go mod tidy
+RUN go build -o ./main
+
+EXPOSE 3003
+CMD ["/app/src/user-service/main"]

src/web-service/Dockerfile

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+FROM golang:1.21-alpine
+RUN apk add --update nodejs npm
+
+WORKDIR /app
+COPY ./src/web-service ./src/web-service
+
+WORKDIR /app/src/web-service/frontend
+RUN npm ci
+RUN npm run build
+
+WORKDIR /app/src/web-service
+RUN go build -o ./main
+
+EXPOSE 3000
+CMD ["/app/src/web-service/main"]