ci: update

Author: cn-src

.github/workflows/gradle.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ 11 ]
+        java: [ 8,11 ]
     steps:
       - uses: actions/checkout@v2
       - name: Set up JDK

Jenkinsfile

@@ -1,7 +1,14 @@
 pipeline {
     agent any
     stages {
-
+        stage('build-Java8') {
+            tools {
+                    jdk "Java8"
+            }
+            steps {
+                sh "./gradlew clean build"
+            }
+        }
         stage('build-Java11') {
             tools {
                     jdk "Java11"