Add a (non modular) upstream kernel build, for pinata alpha and general testing

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

kernel/Dockerfile

@@ -0,0 +1,32 @@
+FROM debian:jessie
+
+ENV KERNEL_VERSION 4.1.13
+
+RUN apt-get update && apt-get -y upgrade && apt-get -y install \
+  unzip \
+  xz-utils \
+  curl \
+  bc \
+  build-essential \
+  cpio \
+  gcc libc6 libc6-dev \
+  kmod \
+  squashfs-tools \
+  genisoimage \
+  xorriso \
+  syslinux \
+  isolinux \
+  automake \
+  pkg-config \
+  p7zip-full
+
+ADD https://www.kernel.org/pub/linux/kernel/v4.x/linux-${KERNEL_VERSION}.tar.xz .
+
+RUN cat linux-${KERNEL_VERSION}.tar.xz | tar --absolute-names -xJ &&  mv /linux-${KERNEL_VERSION} /linux
+
+COPY kernel_config /linux/.config
+
+RUN jobs=$(nproc); \
+    cd /linux && \
+    make -j ${jobs} oldconfig && \
+    make -j ${jobs} bzImage

kernel/Makefile

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+all:	vmlinuz64
+
+vmlinuz64:
+	docker build -t mobykernel:test .
+	docker run -i mobykernel:test cat /linux/arch/x86_64/boot/bzImage > vmlinuz64
+
+clean:
+	rm vmlinuz64

kernel/README.md

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+Temporary non modular kernel config for pinata alpha
+
+TODO: build with Alpine and/or use Alpine kernels - needs some patches.