fixing issue with firebase on deploy

backend/src/main/java/dev/ksan/etfoglasiserver/config/FirebaseConfig.java

@@ -4,20 +4,25 @@ import com.google.auth.oauth2.GoogleCredentials;
 import com.google.firebase.FirebaseApp;
 import com.google.firebase.FirebaseOptions;
 import com.google.firebase.messaging.FirebaseMessaging;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.io.ClassPathResource;
 
+import java.io.FileInputStream;
 import java.io.IOException;
 import java.util.List;
 
 @Configuration
 public class FirebaseConfig {
 
+    @Value("${firebase.credentials.path}")
+    private String credentialsPath;
+
     @Bean
     public FirebaseApp firebaseApp() throws IOException {
         GoogleCredentials credentials = GoogleCredentials
-                .fromStream(new ClassPathResource("firebase.json").getInputStream())
+                .fromStream(new FileInputStream(credentialsPath))
                 .createScoped(List.of("https://www.googleapis.com/auth/firebase.messaging"));
 
         FirebaseOptions options = FirebaseOptions.builder()