[CI] Fix pipeline template artifacts struct bug and cleanup bug

Signed-off-by: liushilongbuaa <shilongliu@microsoft.com>

.azure-pipelines/azure-pipelines-image-template.yml

@@ -45,7 +45,9 @@ jobs:
           ENABLE_DOCKER_BASE_PULL=y make PLATFORM=$(PLATFORM_AZP) PLATFORM_ARCH=$(PLATFORM_ARCH) configure
         displayName: 'Make configure'
     postSteps:
-      - publish: $(System.DefaultWorkingDirectory)/target
+      - script: cp target -r $(Build.ArtifactStagingDirectory)/
+        displayName: Copy Artifacts
+      - publish:  $(Build.ArtifactStagingDirectory)
         artifact: 'sonic-buildimage.$(GROUP_NAME)$(GROUP_EXTNAME)'
         displayName: "Archive sonic image"
       - ${{ parameters.postSteps }}

.azure-pipelines/cleanup.yml

@@ -0,0 +1,14 @@
+steps:
+- script: |
+    if sudo [ -f /var/run/march/docker.pid ] ; then
+        pid=`sudo cat /var/run/march/docker.pid` ; sudo kill $pid
+    fi
+    sudo rm -f /var/run/march/docker.pid
+    sudo rm -rf /data/march/docker
+
+    # clean native docker build
+    if sudo [ -f dockerfs/var/run/docker.pid ] ; then
+        pid=`sudo cat dockerfs/var/run/docker.pid` ; sudo kill $pid
+    fi
+    sudo rm -rf $(ls -A1)
+  displayName: "Clean Workspace"