Import manibuilder from flashrom master

References to the upstream repository have been changed to
`flashrom-stable.git`. The directory `flashrom` is kept,
though, so existing containers can be used for both projects.

Change-Id: I8ba148e30602e8e03e3858f7c1eb6789230654d6
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/70906
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/util/manibuilder/Dockerfile.qemu-user-static b/util/manibuilder/Dockerfile.qemu-user-static
new file mode 100644
index 0000000..b6de7eb
--- /dev/null
+++ b/util/manibuilder/Dockerfile.qemu-user-static
@@ -0,0 +1,3 @@
+FROM multiarch/qemu-user-static:register
+
+RUN sed -i -e's/ mipsn32 mipsn32el / /' /qemu-binfmt-conf.sh