ci: Build and test OpenVMM runtime-rs on AKS

Build the pinned OpenVMM binary from source and package it in the Kata
payload. Wire the openvmm-azure-runtime-rs shim into kata-deploy and
Helm.

Add OpenVMM to the shared amd64 asset matrix and run small and normal
cbl-mariner AKS jobs. Select runtime-rs paths in test helpers and skip
the known unsupported BlockModern emptyDir path.

Signed-off-by: Aurélien Bombo <abombo@microsoft.com>
Generated-By: GitHub Copilot

tools/packaging/scripts/lib.sh

@@ -205,6 +205,11 @@ get_busybox_image_name() {
 	echo "${BUILDER_REGISTRY}:busybox-$(get_last_modification "${busybox_script_dir}")-$(uname -m)"
 }
 
+get_openvmm_image_name() {
+	openvmm_script_dir="${repo_root_dir}/tools/packaging/static-build/openvmm"
+	echo "${BUILDER_REGISTRY}:openvmm-$(get_last_modification "${openvmm_script_dir}")-$(uname -m)"
+}
+
 get_virtiofsd_image_name() {
 	ARCH=${ARCH:-$(uname -m)}
 	case ${ARCH} in