完善 ci 流程，发版后自动发布 jar 到 maven 仓库

Author: klboke

.github/workflows/publish.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up JDK 8
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v1
         with:
           java-version: 8