ci: Implement build step for CSI driver

This fully implements the compilation step for csi-kata-directvolume.
This component can now be built by the CI running:

 $ cd tools/packaging/kata-deploy/local-build
 $ make csi-kata-directvolume-tarball

A couple notes:

 * When installing the binary, we rename it from directvolplugin to
   csi-kata-directvolume on the fly to make it more readable.
 * We add go to the tools builder Dockerfile to support building this
   tool.
 * I've noticed the file install_libseccomp.sh gets created by the build
   process so I've added it to a .gitignore.

Signed-off-by: Aurélien Bombo <abombo@microsoft.com>

tools/packaging/kata-deploy/local-build/Makefile

@@ -99,7 +99,7 @@ cloud-hypervisor-glibc-tarball:
 	${MAKE} $@-build
 
 csi-kata-directvolume-tarball: copy-scripts-for-the-tools-build
-	$(call DUMMY,$@)
+	${MAKE} $@-build
 
 firecracker-tarball:
 	${MAKE} $@-build

tools/packaging/kata-deploy/local-build/kata-deploy-binaries.sh

@@ -99,6 +99,7 @@ options:
 	coco-guest-components
 	cloud-hypervisor
 	cloud-hypervisor-glibc
+	csi-kata-directvolume
 	firecracker
 	genpolicy
 	kata-ctl
@@ -1022,6 +1023,7 @@ install_tools_helper() {
 
 	tool_binary=${tool}
 	[ ${tool} = "agent-ctl" ] && tool_binary="kata-agent-ctl"
+	[ ${tool} = "csi-kata-directvolume" ] && tool_binary="directvolplugin"
 	[ ${tool} = "trace-forwarder" ] && tool_binary="kata-trace-forwarder"
 	binary=$(find ${repo_root_dir}/src/tools/${tool}/ -type f -name ${tool_binary})
 
@@ -1043,6 +1045,7 @@ install_tools_helper() {
 
 	info "Install static ${tool_binary}"
 	mkdir -p "${destdir}/opt/kata/bin/"
+	[ ${tool} = "csi-kata-directvolume" ] && tool_binary="csi-kata-directvolume"
 	install -D --mode ${binary_permissions} ${binary} "${destdir}/opt/kata/bin/${tool_binary}"
 }
 
@@ -1054,6 +1057,10 @@ install_genpolicy() {
 	install_tools_helper "genpolicy"
 }
 
+install_csi_kata_directvolume() {
+	install_tools_helper "csi-kata-directvolume"
+}
+
 install_kata_ctl() {
 	install_tools_helper "kata-ctl"
 }
@@ -1131,6 +1138,8 @@ handle_build() {
 
 	cloud-hypervisor-glibc) install_clh_glibc ;;
 
+	csi-kata-directvolume) install_csi_kata_directvolume ;;
+
 	firecracker) install_firecracker ;;
 
 	genpolicy) install_genpolicy ;;
@@ -1350,6 +1359,7 @@ main() {
 		agent-ctl
 		cloud-hypervisor
 		coco-guest-components
+		csi-kata-directvolume
 		firecracker
 		genpolicy
 		kata-ctl