add checkstyle github actions

.github/workflows/checkstyle.yml

@@ -0,0 +1,23 @@
+name: Checkstyle
+
+on:
+  push:
+
+jobs:
+  build-gradle-project:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout project sources
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 17
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Checkstyle
+        run: ./gradlew checkstyleMain

build.gradle

@@ -1,5 +1,6 @@
 plugins {
     id 'java'
+    id 'checkstyle'
 }
 
 repositories {

config/checkstyle/checkstyle.xml

@@ -0,0 +1,15 @@
+<?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="AvoidStarImport"/>
+        <module name="UnnecessaryParentheses"/>
+        <module name="UnusedImports"/>
+        <module name="EmptyCatchBlock"/>
+        <module name="LeftCurly"/>
+        <module name="RightCurly"/>
+        <module name="NeedBraces"/>
+    </module>
+</module>

src/main/java/work/fking/masteringmixology/PotionType.java

@@ -2,7 +2,9 @@
 
 import java.util.Arrays;
 
-import static work.fking.masteringmixology.PotionComponent.*;
+import static work.fking.masteringmixology.PotionComponent.AGA;
+import static work.fking.masteringmixology.PotionComponent.LYE;
+import static work.fking.masteringmixology.PotionComponent.MOX;
 
 public enum PotionType {
     MAMMOTH_MIGHT_MIX(60, 1350, MOX, MOX, MOX),