tools: docker: Build and install genimage

genimage [1] is a tool to create flash/disk images. This is required
by some targets, e.g.: sifive_unleashed, to generate sdcard or spi-nor
images for real hardware, as well as U-Boot CI testing.

[1] https://github.com/pengutronix/genimage

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/tools/docker/Dockerfile b/tools/docker/Dockerfile
index 82312e9..92113dc 100644
--- a/tools/docker/Dockerfile
+++ b/tools/docker/Dockerfile
@@ -60,6 +60,7 @@
 	iasl \
 	imagemagick \
 	iputils-ping \
+	libconfuse-dev \
 	libgit2-dev \
 	libguestfs-tools \
 	liblz4-tool \
@@ -177,6 +178,14 @@
 	make -j$(nproc) all install && \
 	rm -rf /tmp/qemu
 
+# Build genimage (required by some targets to generate disk images)
+RUN wget -O - https://github.com/pengutronix/genimage/releases/download/v14/genimage-14.tar.xz | tar -C /tmp -xJ && \
+	cd /tmp/genimage-14 && \
+	./configure && \
+	make -j$(nproc) && \
+	make install && \
+	rm -rf /tmp/genimage-14
+
 # Create our user/group
 RUN echo uboot ALL=NOPASSWD: ALL > /etc/sudoers.d/uboot
 RUN useradd -m -U uboot