feat(golang-cobra): shrink the Dockerfile binary through UPX

golang-cobra/{{ cookiecutter.project_name }}/Dockerfile

@@ -1,7 +1,12 @@
 FROM golang AS builder
 ARG GIT_COMMIT
 ARG GIT_REPO="{{ cookiecutter.repo }}"
+ARG UPX_VERSION=4.2.4
 ARG VERSION
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates xz-utils \
+  && curl -Ls https://github.com/upx/upx/releases/download/v${UPX_VERSION}/upx-${UPX_VERSION}-amd64_linux.tar.xz -o - | tar xvJf - -C /tmp \
+  && cp /tmp/upx-${UPX_VERSION}-amd64_linux/upx /usr/local/bin/ \
+  && chmod +x /usr/local/bin/upx
 WORKDIR /app
 ADD . .
 ENV CGO_ENABLED=0
@@ -11,10 +16,11 @@ RUN go build \
   -ldflags \
   "-w -s -X $GIT_REPO/cmd.Version=$VERSION -X $GIT_REPO/cmd.GitCommit=$GIT_COMMIT" \
   -o /app/app
+RUN upx --ultra-brute -qq /app/app && upx -t /app/app
 ENTRYPOINT /app/app
 
-FROM alpine
-RUN apk --no-cache add ca-certificates
-WORKDIR /app
+FROM scratch
+WORKDIR /appq
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=builder /app/app /app
 ENTRYPOINT [ "/app/app" ]