Only use known feeds on CI

DeviceTests/build.cake

@@ -41,6 +41,7 @@ System.Environment.SetEnvironmentVariable("PATH",
     $"{ANDROID_HOME}/emulator" + System.IO.Path.PathSeparator +
     EnvironmentVariable("PATH"));
 
+var RESTORE_CONFIG = MakeAbsolute((FilePath)"../devopsnuget.config").FullPath;
 
 // utils
 
@@ -99,6 +100,7 @@ Task("build-ios")
         c.Properties["Platform"] = new List<string> { "iPhoneSimulator" };
         c.Properties["BuildIpa"] = new List<string> { "true" };
         c.Properties["ContinuousIntegrationBuild"] = new List<string> { "false" };
+        c.Properties["RestoreConfigFile"] = new List<string> { RESTORE_CONFIG };
         c.Targets.Clear();
         c.Targets.Add("Rebuild");
         c.BinaryLogger = new MSBuildBinaryLogSettings {
@@ -142,6 +144,7 @@ Task("build-android")
         c.Configuration = "Debug"; // needs to be debug so unit tests get discovered
         c.Restore = true;
         c.Properties["ContinuousIntegrationBuild"]  = new List<string> { "false" };
+        c.Properties["RestoreConfigFile"] = new List<string> { RESTORE_CONFIG };
         c.Targets.Clear();
         c.Targets.Add("Rebuild");
         c.Targets.Add("SignAndroidPackage");
@@ -221,6 +224,7 @@ Task("build-uwp")
         c.Properties["AppxBundlePlatforms"] = new List<string> { "x86" };
         c.Properties["AppxBundle"] = new List<string> { "Always" };
         c.Properties["AppxPackageSigningEnabled"] = new List<string> { "true" };
+        c.Properties["RestoreConfigFile"] = new List<string> { RESTORE_CONFIG };
         c.Targets.Clear();
         c.Targets.Add("Rebuild");
         c.BinaryLogger = new MSBuildBinaryLogSettings {

build.cake

@@ -4,6 +4,8 @@ var NUGET_VERSION = EnvironmentVariable("NUGET_VERSION") ?? "1.0.0";
 var GIT_SHA = Argument("gitSha", EnvironmentVariable("GIT_SHA") ?? "");
 var GIT_BRANCH_NAME = Argument("gitBranch", EnvironmentVariable("GIT_BRANCH_NAME") ?? "");
 
+var RESTORE_CONFIG = MakeAbsolute(new FilePath("./devopsnuget.config")).FullPath;
+
 Task("prepare")
 	.Does(() =>
 {
@@ -18,6 +20,7 @@ Task("libs")
 	MSBuild("./Xamarin.Essentials/Xamarin.Essentials.csproj", new MSBuildSettings()
 		.EnableBinaryLogger("./output/binlogs/libs.binlog")
 		.SetConfiguration("Release")
+		.WithProperty("RestoreConfigFile", RESTORE_CONFIG)
 		.WithRestore());
 });
 
@@ -32,6 +35,7 @@ Task("nugets")
 		.SetConfiguration("Release")
 		.WithRestore()
 		.WithProperty("PackageOutputPath", MakeAbsolute(new FilePath("./output/")).FullPath)
+		.WithProperty("RestoreConfigFile", RESTORE_CONFIG)
 		.WithTarget("Pack"));
 });
 
@@ -46,6 +50,9 @@ Task("tests")
 			DotNetCoreTest(csproj.FullPath, new DotNetCoreTestSettings {
 				Configuration = "Release",
 				Logger = $"trx;LogFileName={csproj.GetFilenameWithoutExtension()}.trx",
+				EnvironmentVariables = new Dictionary<string, string> {
+					{ "RestoreConfigFile", RESTORE_CONFIG }
+				}
 			});
 		} catch (Exception) {
 			failed++;
@@ -67,6 +74,7 @@ Task("samples")
 	MSBuild("./Xamarin.Essentials.sln", new MSBuildSettings()
 		.EnableBinaryLogger("./output/binlogs/samples.binlog")
 		.SetConfiguration("Release")
+		.WithProperty("RestoreConfigFile", RESTORE_CONFIG)
 		.WithRestore());
 });
 
@@ -79,6 +87,7 @@ Task("docs")
 		.EnableBinaryLogger("./output/binlogs/docs.binlog")
 		.SetConfiguration("Release")
 		.WithRestore()
+		.WithProperty("RestoreConfigFile", RESTORE_CONFIG)
 		.WithTarget("mdocupdatedocs"));
 });
 

devopsnuget.config

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <clear/>
+    <add key="dotnet-eng" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json" protocolVersion="3" />
+    <add key="dotnet-public" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" protocolVersion="3" />
+  </packageSources>
+  <activePackageSource>
+    <add key="All" value="(Aggregate source)" />
+  </activePackageSource>
+</configuration>