Merge branch '1-use-nproc-build-jobs-as-makepkg-default' into 'master'

set default number of parallel make jobs to `$(nproc)`

Closes #1 
/spend 15m

See merge request !2

Dockerfile

@@ -24,6 +24,8 @@ USER root
 RUN pacman -Syy -q --noconfirm git base-devel && \
     printf "y\\ny\\n" | pacman -Scc
 
+RUN sed -r -i 's|^#?(MAKEFLAGS=).*|\1"-j$(nproc)"|' /etc/makepkg.conf
+
 USER $UNAME
 RUN cd /tmp && \
     git clone https://aur.archlinux.org/package-query.git && \