cuda10.2-vectorAdd should not run dnf update
RUN dnf update -y && dnf install -y git make && \
rm -rf /var/cache/dnf/*
should be
RUN dnf install -y git make && \
rm -rf /var/cache/dnf/*
RUN dnf update -y && dnf install -y git make && \
rm -rf /var/cache/dnf/*
should be
RUN dnf install -y git make && \
rm -rf /var/cache/dnf/*