Create Dockerfile

Dockerfile

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+FROM golang:1.21-alpine AS build
+WORKDIR /app
+RUN apk add --no-cache git
+COPY . .
+RUN go mod tidy && go build -o server main.go
+
+FROM alpine:3.18
+WORKDIR /app
+COPY --from=build /app/server .
+ENV PORT=7860
+EXPOSE 7860
+CMD ["./server"]