Add linter actions

.gitea/workflows/smart-clinic-lint-backend.yml

@@ -0,0 +1,24 @@
+name: Lint Java Backend
+on:
+  pull_request:
+    paths:
+      - SmartClinicManagementSystem/**
+  push:
+    paths:
+      - SmartClinicManagementSystem/**
+jobs:
+  lint-java:
+    runs-on: node20
+    name: Checkstyle Java Linting
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+      - name: Download Checkstyle
+        run: curl -L -o checkstyle.jar https://github.com/checkstyle/checkstyle/releases/download/checkstyle-10.12.1/checkstyle-10.12.1-all.jar
+      - name: Run Checkstyle
+        run: |
+          java -jar checkstyle.jar -c /google_checks.xml app/src/main/java/com/project/back_end || true