Fix SourcesDirectory parameter fallback for GitHub Actions in Update-DotNetSdkVersions.ps1

[Copilot]

The Update-DotNetSdkVersions.ps1 script defaulted $SourcesDirectory to $env:BUILD_SOURCESDIRECTORY, which is unset in GitHub Actions, causing Join-Path to throw when the script is invoked without explicit parameters.

Changes

• Parameter default: Added conditional fallback checking $env:BUILD_SOURCESDIRECTORY → $env:GITHUB_WORKSPACE → (Get-Location).Path
• Validation: Added null/whitespace checks, directory existence validation, and path normalization with Resolve-Path
• Documentation: Updated parameter help to reflect multi-environment support

This matches the pattern already used in Update-NuGetPackageVersions.ps1:

[Parameter(Mandatory = $false)]
[string]$SourcesDirectory = $(
    if ($env:BUILD_SOURCESDIRECTORY) {
        $env:BUILD_SOURCESDIRECTORY
    }
    elseif ($env:GITHUB_WORKSPACE) {
        $env:GITHUB_WORKSPACE
    }
    else {
        (Get-Location).Path
    }
),

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• aka.ms
  • Triggering command: `/usr/bin/pwsh pwsh -Command

Simulate GitHub Actions environment

Remove-Item env:BUILD_SOURCESDIRECTORY -ErrorAction SilentlyContinue
$env:GITHUB_WORKSPACE = '/home/REDACTED/work/Omex/Omex'

Run the script - it will try to update, so we'll timeout after init

Write-Host 'Testing sc` (dns block)

• Triggering command: `/usr/bin/pwsh pwsh -Command

Simulate local environment - no CI/CD variables

Remove-Item env:BUILD_SOURCESDIRECTORY -ErrorAction SilentlyContinue
Remove-Item env:GITHUB_WORKSPACE -ErrorAction SilentlyContinue

Write-Host 'Testing script in local environment (no CI variables)...'
.` (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)