Sync eng/common directory with azure-sdk-tools for PR 14377

[azure-sdk]

Sync eng/common directory with azure-sdk-tools for PR Azure/azure-sdk-tools#14377 See eng/common workflow

[Copilot]

Pull request overview

Syncs eng/common pipeline templates with the corresponding changes from azure-sdk-tools PR 14377 by adding a reusable step template to authenticate npm using a temporary .npmrc.

Changes:

• Adds a new pipeline step template that copies a repo .npmrc into the agent temp directory (or creates one if missing).
• Sets NPM_CONFIG_USERCONFIG to point npm tooling at the temporary .npmrc, then runs npmAuthenticate@0 against it.

[Copilot]

The PowerShell step doesn’t set $ErrorActionPreference = 'Stop' (or use -ErrorAction Stop), so a non-terminating error from Copy-Item/New-Item could allow the step to continue and fail later in npmAuthenticate@0 with a less actionable error. Consider forcing terminating behavior and/or explicitly checking the copy/create result before setting NPM_CONFIG_USERCONFIG.

Suggested change

	$repoNpmrc = "${{ parameters.RepoNpmrc }}"
	$tempNpmrc = "$(Agent.TempDirectory)/.npmrc"
	if (Test-Path $repoNpmrc) {
	Copy-Item $repoNpmrc $tempNpmrc -Force
	} else {
	New-Item -Path $tempNpmrc -ItemType File -Force | Out-Null
	$ErrorActionPreference = 'Stop'
	$repoNpmrc = "${{ parameters.RepoNpmrc }}"
	$tempNpmrc = "$(Agent.TempDirectory)/.npmrc"
	if (Test-Path $repoNpmrc) {
	Copy-Item $repoNpmrc $tempNpmrc -Force -ErrorAction Stop
	} else {
	New-Item -Path $tempNpmrc -ItemType File -Force -ErrorAction Stop | Out-Null