Change build definition (#230)

* Change build definition

build.cake

@@ -311,8 +311,8 @@ Task("BuildAndroidContentProvider").Does(()=>
 
 // Install Unity Editor for Windows
 Task("Install-Unity-Windows").Does(() => {
-    const string unityDownloadUrl = @"https://netstorage.unity3d.com/unity/88933597c842/Windows64EditorInstaller/UnitySetup64-2018.2.17f1.exe";
-    const string il2cppSupportDownloadUrl = @"https://netstorage.unity3d.com/unity/88933597c842/TargetSupportInstaller/UnitySetup-UWP-IL2CPP-Support-for-Editor-2018.2.17f1.exe";
+    string unityDownloadUrl = EnvironmentVariable("EDITOR_URL_WIN");
+    string il2cppSupportDownloadUrl = EnvironmentVariable("IL2CPP_SUPPORT_URL");
     // const string dotNetSupportDownloadUrl = @"https://netstorage.unity3d.com/unity/88933597c842/TargetSupportInstaller/UnitySetup-UWP-.NET-Support-for-Editor-2018.2.17f1.exe";
 
     Information("Downloading Unity Editor...");

scripts/install-unity.sh

@@ -3,9 +3,9 @@
 # Note: Registering and unregistering is handled by build.cake.
 
 # Unity tool download URLs.
-EDITOR_URL="https://download.unity3d.com/download_unity/88933597c842/MacEditorInstaller/Unity-2018.2.17f1.pkg"
-ANDROID_URL="https://download.unity3d.com/download_unity/88933597c842/MacEditorTargetInstaller/UnitySetup-Android-Support-for-Editor-2018.2.17f1.pkg"
-IOS_URL="https://download.unity3d.com/download_unity/88933597c842/MacEditorTargetInstaller/UnitySetup-iOS-Support-for-Editor-2018.2.17f1.pkg"
+EDITOR_URL="$EDITOR_URL"
+ANDROID_URL="$ANDROID_SUPPORT_URL"
+IOS_URL="$IOS_SUPPORT_URL"
 
 # Put downloads in a temporary folder
 TEMP_FOLDER="UnityTempDownloads"