fix: Firebase 인증 파일 읽기 오류

- jar 파일로 배포하기 때문에 getFile()이 아닌 getInputStream()을 사용해야 한다.

Author: csct3434

src/main/java/xyz/fanpool/chat_service/common/config/firebase/FirebaseConfig.java

@@ -11,7 +11,7 @@
 import org.springframework.core.io.ResourceLoader;
 import org.springframework.stereotype.Component;
 
-import java.io.FileInputStream;
+import java.io.InputStream;
 
 @Slf4j
 @Component
@@ -30,7 +30,7 @@ public FirebaseConfig(@Value("${firebase.credential-path}") String path, Resourc
 	@PostConstruct
 	public void init() {
 		try {
-			FileInputStream serviceAccount = new FileInputStream(resourceLoader.getResource(CREDENTIAL_PATH).getFile());
+			InputStream serviceAccount = resourceLoader.getResource(CREDENTIAL_PATH).getInputStream();
 
 			FirebaseOptions options = FirebaseOptions.builder()
 					.setCredentials(GoogleCredentials.fromStream(serviceAccount))