automation: Linux 5.10.74 test-artifact

Build a 5.10 kernel to be used as Dom0 and DomU kernel for testing. This
is almost the same as the existing ARM64 recipe for Linux 5.9, the
only differences are:
- upgrade to latest 5.10.x stable
- force Xen modules to built-in (on ARM it was already done by defconfig)

Also add the exporting job to build.yaml so that the binary can be used
during gitlab-ci runs.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

automation/gitlab-ci/build.yaml

@@ -609,3 +609,14 @@ alpine-3.12-rootfs-export:
       - binaries/initrd.tar.gz
   tags:
     - x86_64
+
+kernel-5.10.74-export:
+  stage: build
+  image: registry.gitlab.com/xen-project/xen/tests-artifacts/kernel:5.10.74
+  script:
+    - mkdir binaries && cp /bzImage binaries/bzImage
+  artifacts:
+    paths:
+      - binaries/bzImage
+  tags:
+    - x86_64

automation/tests-artifacts/kernel/5.10.74.dockerfile

@@ -0,0 +1,38 @@
+FROM debian:unstable
+LABEL maintainer.name="The Xen Project" \
+      maintainer.email="xen-devel@lists.xenproject.org"
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV LINUX_VERSION=5.10.74
+ENV USER root
+
+RUN mkdir /build
+WORKDIR /build
+
+# build depends
+RUN apt-get update && \
+    apt-get --quiet --yes install \
+        build-essential \
+        libssl-dev \
+        bc \
+        curl \
+        flex \
+        bison \
+        libelf-dev \
+        && \
+    apt-get autoremove -y && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists* /tmp/* /var/tmp/*
+
+# Build the kernel
+RUN curl -fsSLO https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-"$LINUX_VERSION".tar.xz && \
+    tar xvJf linux-"$LINUX_VERSION".tar.xz && \
+    cd linux-"$LINUX_VERSION" && \
+    make defconfig && \
+    make xen.config && \
+    cp .config .config.orig && \
+    cat .config.orig | grep XEN | grep =m |sed 's/=m/=y/g' >> .config && \
+    make -j$(nproc) bzImage && \
+    cp arch/x86/boot/bzImage / && \
+    cd /build && \
+    rm -rf linux-"$LINUX_VERSION"*