Dockerfile: backtrack more

Signed-off-by: Nowa Ammerlaan <[email protected]>

Author: Nowa-Ammerlaan

Dockerfile

@@ -5,6 +5,6 @@ RUN wget --progress=dot:mega -O - https://github.com/gentoo-mirror/gentoo/archiv
 RUN echo -e "ACCEPT_KEYWORDS=\"~amd64\"\nACCEPT_LICENSE=\"*\"\nFEATURES=\"-news -sandbox -usersandbox -cgroup binpkg-multi-instance -binpkg-docompress -binpkg-dostrip parallel-install -ipc-sandbox -network-sandbox -pid-sandbox binpkg-ignore-signature buildpkg getbinpkg\"\nMAKEOPTS=\"--jobs=$(nproc) --load-average=$(nproc)\"\nUSE=\"-initramfs kernel-install boot ukify -bash dash\"" >> /etc/portage/make.conf
 RUN echo -e "sys-kernel/installkernel systemd -dracut -grub -systemd-boot -uki -ukify" >> /etc/portage/package.use/installkernel
 RUN echo -e "sys-kernel/installkernel **" >> /etc/portage/package.accept_keywords/installkernel
-RUN emerge --jobs="$(nproc)" --load-average="$(nproc)" sys-kernel/gentoo-kernel-bin app-text/tree app-text/asciidoc sys-apps/systemd sys-kernel/dracut sys-boot/grub sys-kernel/installkernel sys-fs/dosfstools sys-boot/refind app-alternatives/sh
+RUN emerge --jobs="$(nproc)" --load-average="$(nproc)" --backtrack=10000 sys-kernel/gentoo-kernel-bin app-text/tree app-text/asciidoc sys-apps/systemd sys-kernel/dracut sys-boot/grub sys-kernel/installkernel sys-fs/dosfstools sys-boot/refind app-alternatives/sh
 
 CMD /tmp/installkernel-gentoo-9999/run_tests.sh