updated the build file

.github/workflows/maven.yml

@@ -1,6 +1,5 @@
 # This workflow will build a Java project with Maven
 # For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
-
 name: Java CI and Sonar check with Maven
 
 on:
@@ -32,7 +31,7 @@ jobs:
         uses: actions/cache@v3
         with:
           path: ~/.m2
-          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/back/pom.xml') }}
           restore-keys: ${{ runner.os }}-m2
       - name: Build and analyze
         env: