feat: create check-lint job (#7)

- [x] Должна зависеть от build
- [x] Должна запускать mvn checkstyle:check
- [x] В корне должен лежать checkstyle.xml

Author: vladcheck

.github/actions/setup-jdk/action.yml

@@ -5,7 +5,7 @@ runs:
   using: "composite"
   steps:
     - name: Set up JDK 25
-      uses: actions/setup-java@v5
+      uses: actions/setup-java@v6
       with:
         java-version: '25'
         distribution: 'temurin'

.github/workflows/workflow.yml

@@ -13,7 +13,7 @@ jobs:
       contents: write
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v7
     - name: Set up JDK
       uses: ./.github/actions/setup-jdk
     - name: Build with Maven
@@ -31,8 +31,20 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
       - name: Set up JDK
         uses: ./.github/actions/setup-jdk
       - name: Check formatting
-        run: mvn -B spotless:check --file pom.xml
+        run: mvn -B spotless:check --file pom.xml
+
+  lint:
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v7
+      - name: Set up JDK
+        uses: ./.github/actions/setup-jdk
+      - name: Check lint
+        run: mvn -B checkstyle:check --file pom.xml

checkstyle.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+  "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+  "https://checkstyle.org/dtds/configuration_1_3.dtd">
+<module name="Checker">
+  <module name="TreeWalker">
+    <module name="UnusedImports"/>
+    <module name="RedundantImport"/>
+    <module name="EqualsHashCode"/>
+  </module>
+</module>

pom.xml

@@ -197,6 +197,24 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>3.6.0</version>
+                <configuration>
+                    <configLocation>checkstyle.xml</configLocation>
+                    <consoleOutput>true</consoleOutput>
+                    <failOnViolation>true</failOnViolation>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>verify</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
-</project>
+</project>