Add Manibuilder

Add a set of Dockerfiles for build testing. If you have an x86 machine
and ~20GiB free disk space, run `make register` and `make -jxx` in
util/manibuilder and go eat some pizza. The former runs a privileged
docker container to set binfmt_misc up for qemu (read the code, don't
trust it).

Regarding the build targets, this is the original state of Manibuilder
as it was used to build-test `flashrom-1.0`. Some fixes to the frame-
work were applied, but fixups for the targets will be done in separate
patches to maintain their original state for reference.

Change-Id: I60863a5c7d70dde71486fccb66cb59b30ba4d982
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/23005
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

util/manibuilder/Dockerfile.ubuntu-debootstrap

@@ -0,0 +1,33 @@
+FROM manibase
+
+RUN \
+	useradd -p locked -m mani && \
+	if grep -q main /etc/apt/sources.list; then \
+		if ! grep -q universe /etc/apt/sources.list; then \
+			sed -i -e 's/ main$/ main universe/' \
+				/etc/apt/sources.list || exit 1; \
+		fi; \
+	else \
+		url="http://ports.ubuntu.com/" && \
+		cn="$(sed -ne's/DISTRIB_CODENAME=//p' /etc/lsb-release)" && \
+		for t in "" "-updates" "-security"; do \
+			echo "deb ${url} ${cn}${t} main universe" \
+				>>/etc/apt/sources.list || exit 1; \
+		done; \
+	fi && \
+	apt-get -qq update && \
+	apt-get -qq upgrade && \
+	apt-get -qq dist-upgrade && \
+	apt-get -qqy install gcc make git doxygen ccache \
+		libpci-dev libusb-dev libftdi-dev libusb-1.0-0-dev && \
+	apt-get clean
+
+USER mani
+RUN \
+	cd && \
+	mkdir .ccache && chown mani:mani .ccache && \
+	git clone https://review.coreboot.org/flashrom.git
+
+ENV DEVSHELL /bin/bash
+COPY mani-wrapper.sh /home/mani/
+ENTRYPOINT ["/bin/sh", "/home/mani/mani-wrapper.sh"]