fix: use environment variable for PIP_ROOT_USER_ACTION

This extends the fix from actions#259 since every platform for 3.8.10 / 3.9.13 has been rebuilt instead of just macOS arm64 being added.

The regression was introduced in actions#223

installers/nix-setup-template.sh

@@ -49,8 +49,9 @@ fi
 chmod +x ../python $PYTHON_MAJOR $PYTHON_MAJOR_DOT_MINOR $PYTHON_MAJORMINOR python
 
 echo "Upgrading pip..."
+export PIP_ROOT_USER_ACTION=ignore
 ./python -m ensurepip
-./python -m pip install --ignore-installed pip --disable-pip-version-check --no-warn-script-location --root-user-action=ignore
+./python -m pip install --ignore-installed pip --disable-pip-version-check --no-warn-script-location
 
 echo "Create complete file"
 touch $PYTHON_TOOLCACHE_VERSION_PATH/x64.complete

installers/win-setup-template.ps1

@@ -133,8 +133,9 @@ if ($MajorVersion -ne "2") {
 }
 
 Write-Host "Install and upgrade Pip"
+$Env:PIP_ROOT_USER_ACTION = "ignore"
 $PythonExePath = Join-Path -Path $PythonArchPath -ChildPath "python.exe"
-cmd.exe /c "$PythonExePath -m ensurepip && $PythonExePath -m pip install --upgrade pip --no-warn-script-location --root-user-action=ignore"
+cmd.exe /c "$PythonExePath -m ensurepip && $PythonExePath -m pip install --upgrade pip --no-warn-script-location"
 if ($LASTEXITCODE -ne 0) {
     Throw "Error happened during pip installation / upgrade"
 }