[BOOK-219] chore: .jks 파일 루트 디렉토리에 위치 할 수 있도록 변경

Author: easyhooon

app/build.gradle.kts

@@ -17,7 +17,7 @@ android {
             val propertiesFile = rootProject.file("keystore.properties")
             val properties = Properties()
             properties.load(propertiesFile.inputStream())
-            storeFile = file(properties["STORE_FILE"] as String)
+            storeFile = rootProject.file(properties["STORE_FILE"] as String)
             storePassword = properties["STORE_PASSWORD"] as String
             keyAlias = properties["KEY_ALIAS"] as String
             keyPassword = properties["KEY_PASSWORD"] as String