POC: Windows arm64 runner build (#2022)

Prerelease for windows-arm64 runner build

src/Misc/contentHash/dotnetRuntime/win-arm64

@@ -0,0 +1 @@
+39d0683f0f115a211cb10c473e9574c16549a19d4e9a6c637ded3d7022bf809f

src/Misc/contentHash/externals/win-arm64

@@ -0,0 +1 @@
+e5dace2d41cc0682d096dcce4970079ad48ec7107e46195970eecfdb3df2acef

src/Misc/externals.sh

@@ -3,6 +3,7 @@ PACKAGERUNTIME=$1
 PRECACHE=$2
 
 NODE_URL=https://nodejs.org/dist
+UNOFFICIAL_NODE_URL=https://unofficial-builds.nodejs.org/download/release
 NODE12_VERSION="12.22.7"
 NODE16_VERSION="16.13.0"
 
@@ -134,6 +135,16 @@ if [[ "$PACKAGERUNTIME" == "win-x64" || "$PACKAGERUNTIME" == "win-x86" ]]; then
     fi
 fi
 
+# Download the external tools only for Windows.
+if [[ "$PACKAGERUNTIME" == "win-arm64" ]]; then
+    # todo: replace these with official release when available
+    acquireExternalTool "$UNOFFICIAL_NODE_URL/v${NODE16_VERSION}/$PACKAGERUNTIME/node.exe" node16/bin
+    acquireExternalTool "$UNOFFICIAL_NODE_URL/v${NODE16_VERSION}/$PACKAGERUNTIME/node.lib" node16/bin
+    if [[ "$PRECACHE" != "" ]]; then
+        acquireExternalTool "https://github.com/microsoft/vswhere/releases/download/2.6.7/vswhere.exe" vswhere
+    fi
+fi
+
 # Download the external tools only for OSX.
 if [[ "$PACKAGERUNTIME" == "osx-x64" ]]; then
     acquireExternalTool "$NODE_URL/v${NODE12_VERSION}/node-v${NODE12_VERSION}-darwin-x64.tar.gz" node12 fix_nested_dir

src/Misc/runnerdotnetruntimeassets

@@ -66,12 +66,14 @@ libmscordbi.dylib
 libmscordbi.so
 Microsoft.CSharp.dll
 Microsoft.DiaSymReader.Native.amd64.dll
+Microsoft.DiaSymReader.Native.arm64.dll
 Microsoft.VisualBasic.Core.dll
 Microsoft.VisualBasic.dll
 Microsoft.Win32.Primitives.dll
 Microsoft.Win32.Registry.dll
 mscordaccore.dll
 mscordaccore_amd64_amd64_6.0.522.21309.dll
+mscordaccore_arm64_arm64_6.0.522.21309.dll
 mscordbi.dll
 mscorlib.dll
 mscorrc.debug.dll
@@ -261,4 +263,4 @@ System.Xml.XmlSerializer.dll
 System.Xml.XPath.dll
 System.Xml.XPath.XDocument.dll
 ucrtbase.dll
-WindowsBase.dll
+WindowsBase.dll