Create initial Dockerfile

Dockerfile

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+FROM golang:latest AS build
+WORKDIR /go/src/discord-pocketbot
+COPY . .
+RUN go get -d -v ./...
+RUN CGO_ENABLED=0 GOOS=linux go install -v ./...
+
+FROM alpine:latest
+run apk add --no-cache ca-certificates
+WORKDIR /app
+COPY --from=build /go/bin/discord-pocketbot discord-pocketbot
+CMD ./discord-pocketbot