Terrible dockerfile

FROM ubuntu:bionic as builder

WORKDIR /root/go/src/github.com/boynux/squid-exporter
COPY . .

# Install build utilities
RUN apt update && apt upgrade && apt install -y gccgo gccgo-go upx git

# Compile the binary statically, so it can be run without libraries using gccgo
# and with extra flags to remove debug info.

RUN go get
RUN go install -compiler gccgo -a -gccgoflags "-static -s -w" .

# Compress the binaries with upx to make them even smaller
RUN upx --brute /root/go/bin/squid-exporter

FROM scratch
COPY --from=builder /root/go/bin/squid-exporter /usr/local/bin/squid-exporter

EXPOSE 9301

ENTRYPOINT ["/usr/local/bin/squid-exporter"]