Add linter actions

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

@@ -0,0 +1,23 @@
+name: Compile Java Backend
+on:
+  pull_request:
+    paths:
+      - SmartClinicManagementSystem/**
+  push:
+    paths:
+      - SmartClinicManagementSystem/**
+jobs:
+  compile-backend:
+    runs-on: node20
+    name: Compile Backend Code
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+      - name: Compile with Gradle
+        run: |
+          cd SmartClinicManagementSystem/app
+          ../../gradlew clean build