[jenkins]: build sonic-vs.vhdx image (sonic-net#102)

Signed-off-by: Guohan Lu <lguohan@gmail.com>
Co-Authored-By: Qi Luo <qiluo-msft@users.noreply.github.com>

jenkins/vs/buildimage-vs-image/Jenkinsfile

@@ -58,6 +58,13 @@ mv target/sonic-vs.bin target/sonic-vs-dbg.bin
 mv target/sonic-vs.img.gz target/sonic-vs-dbg.img.gz
 mv target/sonic-vs.img.gz.log target/sonic-vs-dbg.img.gz.log
 make SONIC_CONFIG_BUILD_JOBS=1 $CACHE_OPTIONS target/sonic-vs.img.gz
+read -r -d '' SONIC_RUN_CMDS << EOM
+    gzip -d -c target/sonic-vs.img.gz > target/sonic-vs.img
+    qemu-img convert target/sonic-vs.img -O vhdx -o subformat=dynamic target/sonic-vs.vhdx
+    rm target/sonic-vs.img
+EOM
+declare -x SONIC_RUN_CMDS
+BLDENV=buster make -f Makefile.work sonic-slave-run
 
 rm -rf ../target
 mv target ../