cleaner ci

frontend/android/app/build.gradle

@@ -2,10 +2,12 @@ plugins {
     id "com.android.application"
     id "kotlin-android"
     id "dev.flutter.flutter-gradle-plugin"
+    id 'com.google.android.libraries.mapsplatform.secrets-gradle-plugin'
+
 }
 
 def localProperties = new Properties()
-def localPropertiesFile = rootProject.file('local.properties')
+def localPropertiesFile = rootProject.file('secrets.properties')
 if (localPropertiesFile.exists()) {
     localPropertiesFile.withReader('UTF-8') { reader ->
         localProperties.load(reader)
@@ -52,6 +54,9 @@ android {
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
+        // Placeholders of keys that are replaced by the build system.
+        manifestPlaceholders += [MAPS_API_KEY: "some value"]
+
     }
 
     buildTypes {

frontend/android/app/src/main/AndroidManifest.xml

@@ -32,7 +32,7 @@
         />
         <meta-data
             android:name="com.google.android.geo.API_KEY"
-            android:value="AIzaSyCeWk_D2xvfOHLidvV56EZeQCUybypEntw"
+            android:value="${MAPS_API_KEY}"
         />