Add Dockerfile

Dockerfile

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+FROM golang:alpine AS build
+
+RUN apk add --no-cache git openssh
+
+ENV GOOS=linux
+ENV GOARCH=amd64
+
+WORKDIR /app
+
+COPY . .
+
+RUN go mod download
+RUN go build -o bin/app main.go
+
+FROM alpine:edge
+
+RUN adduser -D -u 1000 junv
+
+WORKDIR /home/junv
+
+USER junv
+
+COPY --from=build /app/bin/app .
+COPY --from=build /app/test*.txt ./
+
+CMD [ "/home/junv/app" ]