Split the large RUN command

The big RUN command is failing: to better debug the issue and explain what it does split it into multiple RUN commands

Dockerfile

@@ -1,10 +1,12 @@
 FROM archlinux:base-devel
 LABEL contributor="[email protected]"
 COPY rootfs/etc/pacman.conf /etc/pacman.conf
-RUN echo -e "keyserver-options auto-key-retrieve" >> /etc/pacman.d/gnupg/gpg.conf && \
-    # Cannot check space in chroot
-    sed -i '/CheckSpace/s/^/#/g' /etc/pacman.conf && \
-    pacman-key --init && \
+RUN echo -e "keyserver-options auto-key-retrieve" >> /etc/pacman.d/gnupg/gpg.conf
+
+# Cannot check space in chroot
+RUN sed -i '/CheckSpace/s/^/#/g' /etc/pacman.conf
+
+RUN pacman-key --init && \
     pacman --noconfirm -Syyuu && \
     pacman --noconfirm -S \
     arch-install-scripts \
@@ -20,12 +22,20 @@ RUN echo -e "keyserver-options auto-key-retrieve" >> /etc/pacman.d/gnupg/gpg.con
     python-markdown-it-py \
     python-setuptools \
     python-wheel \
-    sudo \
-    && \
-    pacman --noconfirm -S --needed git && \
-    echo "%wheel ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers && \
-    useradd build -G wheel -m && \
-    su - build -c "git clone https://aur.archlinux.org/pikaur.git /tmp/pikaur" && \
+    sudo
+
+RUN pacman --noconfirm -S --needed git
+
+# No password asked for wheel group
+RUN echo "%wheel ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+
+# The makepkg tool cannot use root: add a temp user to build packages
+# and add that user to wheel group so that it can install packages
+# without being asked for a password
+RUN useradd build -G wheel -m
+
+# Build and install pikaur
+RUN su - build -c "git clone https://aur.archlinux.org/pikaur.git /tmp/pikaur"
     su - build -c "cd /tmp/pikaur && makepkg -f" && \
     pacman --noconfirm -U /tmp/pikaur/pikaur-*.pkg.tar.zst