Initial commit: Go DNS microservice boilerplate

Dockerfile

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+FROM golang:1.23-alpine AS build
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -o server ./cmd/server
+
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates
+COPY --from=build /app/server /usr/local/bin/server
+EXPOSE 8080
+CMD ["server"]