chore: update install sdk scripts

Author: sant11h

eng/install-sdk.ps1

@@ -9,5 +9,9 @@ Invoke-WebRequest -Uri $installScriptUrl -OutFile $installScript -MaximumRetryCo
 $globalJsonFile = "$PSScriptRoot\..\global.json"
 $dotnetInstallDir = "$PSScriptRoot\.dotnet"
 
-. $installScript  -InstallDir $dotnetInstallDir -JSonFile $globalJsonFile
-. $installScript  -InstallDir $dotnetInstallDir -Channel 10.0
+# SDK from global.json 
+. $installScript -InstallDir $dotnetInstallDir -JSonFile $globalJsonFile
+
+# Runtimes for tests
+. $installScript -InstallDir $dotnetInstallDir -Runtime dotnet -Channel 8.0
+. $installScript -InstallDir $dotnetInstallDir -Runtime dotnet -Channel 9.0

eng/install-sdk.sh

@@ -13,5 +13,9 @@ chmod +x "$install_script"
 global_json_file="$(dirname "$0")/../global.json"
 dotnet_install_dir="$(dirname "$0")/.dotnet"
 
+# SDK from global.json
 "$install_script" --install-dir "$dotnet_install_dir" --jsonfile "$global_json_file"
-"$install_script" --install-dir "$dotnet_install_dir" --channel 10.0
+
+# Runtimes for tests
+"$install_script" --install-dir "$dotnet_install_dir" --runtime dotnet --channel 8.0
+"$install_script" --install-dir "$dotnet_install_dir" --runtime dotnet --channel 9.0