Add Dockerfile

Dockerfile

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+FROM golang:alpine as builder
+
+ARG ACCESS_TOKEN_USR="nothing"
+ARG ACCESS_TOKEN_PWD="nothing"
+
+RUN apk add --no-cache ca-certificates tzdata
+
+WORKDIR /
+
+# Create a netrc file using the credentials specified using --build-arg
+RUN printf "machine git.coopgo.io\n\
+    login ${ACCESS_TOKEN_USR}\n\
+    password ${ACCESS_TOKEN_PWD}\n"\
+    >> ~/.netrc
+RUN chmod 600 ~/.netrc
+
+COPY . .
+
+RUN go mod download && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /server
+
+FROM scratch
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=builder /server /
+
+EXPOSE 8080
+ENTRYPOINT ["/server"]