feat: add checkstyle action

.github/workflows/check.yml

@@ -0,0 +1,18 @@
+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

.github/workflows/release.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Build with Gradle
         uses: gradle/gradle-build-action@937999e9cc2425eddc7fd62d1053baf041147db7
         with:
-          arguments: api:build
+          arguments: api:build -x checkstyleMain -x checkstyleTest
 
       - name: Release-mac
         uses: softprops/action-gh-release@v1

config/checkstyle/checkstyle.xml

@@ -16,13 +16,14 @@
 <module name="Checker">
     <property name="charset" value="UTF-8"/>
 
-    <property name="severity" value="warning"/>
+    <property name="severity" value="error"/>
 
     <property name="fileExtensions" value="java, properties, xml"/>
     <!-- Excludes all 'module-info.java' files              -->
     <!-- See https://checkstyle.org/config_filefilters.html -->
     <module name="BeforeExecutionExclusionFileFilter">
-        <property name="fileNamePattern" value="module\-info\.java$"/>
+        <property name="fileNamePattern"
+                      value=".*[\\/]generated-src[\\/]jooq[\\/].*$"/>
     </module>
     <!-- https://checkstyle.org/config_filters.html#SuppressionFilter -->
     <module name="SuppressionFilter">

plugin/src/test/java/App.java

@@ -33,7 +33,8 @@ public class App {
         // this config is used by mysql
         info.put("useInformationSchema", "true");
 
-        String url = "jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=UTF-8&useSSL=false&allowPublicKeyRetrieval=true";
+        String url = "jdbc:mysql://localhost:3306/demo?"
+                + "useUnicode=true&characterEncoding=UTF-8&useSSL=false&allowPublicKeyRetrieval=true";
         return DriverManager.getConnection(url, info);
     }
 }