FROM alpine:latest
RUN apk add --update wget tar && tar xf upx-3.95-amd64_linux.tar.xz && \
wget https://github.com/upx/upx/releases/download/v3.95/upx-3.95-amd64_linux.tar.xz && \
mv upx-3.95-amd64_linux/upx /usr/local/bin
ENTRYPOINT ["upx"]