Added script to delete plugin and resources, also removed redundant meta files.

.yamato/upm-ci.yml

   name: Pack
   agent:
     type: Unity::VM
-    image: package-ci/win10:stable
-    flavor: b1.large
+    image: package-ci/ubuntu:stable
+    flavor: b1.small
+    ./prepare_package.sh
     - npm install upm-ci-utils@stable -g --registry https://artifactory.prd.cds.internal.unity3d.com/artifactory/api/npm/upm-npm
     - upm-ci package pack --package-path ./com.unity.uiwidgets
   artifacts:

prepare_package.sh

+#!/usr/bin/env bash
+#set -xeuo pipefail
+#set -x
+
+printf "Preparing package:\n"
+
+cd com.unity.uiwidgets
+
+rm -rf Runtime/Plugins
+rm -f Runtime/Plugins.meta
+rm -rf Runtime/Resources/images
+rm -f Runtime/Resources/images.meta
+rm -rf Runtime/Resources/fonts
+rm -f Runtime/Resources/fonts.meta
+
+echo "Removed Resources and Plugins。"
+
+

CONTRIBUTING.md.meta

-fileFormatVersion: 2
-guid: d5079cbdd40a34d6e966a9cb9e355f76
-TextScriptImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

README.md.meta

-fileFormatVersion: 2
-guid: 1f81db83864a64e1787884fbd1e25cba
-TextScriptImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

README-ZH.md.meta

-fileFormatVersion: 2
-guid: 10bb16e0fd5d84445aa576a308664220
-TextScriptImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: