feat:update mail template & add ut (#63)

* feat:update mail template & add ut

* fix: error workflow yml

* feat: add core:check

.github/workflows/auto-check.yml

@@ -0,0 +1,43 @@
+name: check
+on: pull_request
+
+jobs:
+  checkstyle:
+    name: Checkstyle
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: reviewdog/action-setup@v1
+        with:
+          reviewdog_version: latest
+      - name: download checkstyle
+        run: curl -o checkstyle.jar -L https://github.com/checkstyle/checkstyle/releases/download/checkstyle-9.3/checkstyle-9.3-all.jar
+      - name: checkstyle
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: java -jar checkstyle.jar -c config/checkstyle/checkstyle.xml -f xml . | reviewdog -f=checkstyle -name="Checkstyle Report" -reporter="github-check" -fail-on-error=true -level="error" -filter-mode=nofilter
+
+  mysql-integration-test:
+    runs-on: ubuntu-latest
+    services:
+      mysql:
+        image: mysql:5.7
+        ports:
+          - 3306:3306
+        env:
+          MYSQL_ROOT_PASSWORD: "123456"
+          MYSQL_DATABASE: databasir
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: '11'
+          server-id: github # Value of the distributionManagement/repository/id field of the pom.xml
+          settings-path: ${{ github.workspace }} # location for the settings.xml file
+
+      - name: Gradle Permission Grant
+        run: chmod +x ./gradlew
+
+      - name: Gradle Test
+        run: ./gradlew api:check core:check