Bad file descriptor ERROR during apk update in Docker container... Why?
--no-cache option allows to not cache the index locally.That is helpful in keeping the container small.
Also, it is equivalent to apk update at the top and rm -rf /var/cache/apk/ in the end.
So you can try to use it this way:
RUN apk add --update --no-cache bash \ git \ make \ clang \ g++ \ go && \ mkdir -p $REPO && \ mkdir -p $GODIR/src && \ rm -rf /usr/share/man && \ apk del git clang