Build Windows x86 and x64 separately using a matrix

.github/workflows/grpc-tools-build.yml

@@ -40,6 +40,11 @@ jobs:
   windows_build:
     name: Windows grpc-tools Build
     runs-on: windows-latest
+    strategy:
+      matrix:
+        arch: [ia32, x64]
+    env:
+      ARCH: ${{matrix.arch}}
     steps:
       - uses: actions/checkout@v2
         with:
@@ -49,7 +54,7 @@ jobs:
         shell: cmd
       - uses: actions/upload-artifact@v1
         with:
-          name: grpc-tools_windows
+          name: grpc-tools_windows_${{matrix.arch}}
           path: artifacts/
   combine_artifacts:
     name: Combine grpc-tools artifacts

packages/grpc-tools/build_binaries.ps1

@@ -49,9 +49,8 @@ cd $Base
 
 Set-PSDebug -trace 2
 
-$ArchList = "ia32","x64"
+$Arch = $Env:ARCH
 
-foreach ($Arch in $ArchList) {
 if ($Arch -eq "x64") {
   $ArchName = "x64"
 } else {
@@ -74,4 +73,3 @@ foreach ($Arch in $ArchList) {
 Compress-7Zip -Path ($Base + "/Archive.tar") -Format GZip -ArchiveFileName ($OutDir + "/win32-" + $Arch + ".tar.gz")
 
 & git clean -xdf .
-}