fix(ci): install git before Arch checkout

Arch containers lack git at job start, so actions/checkout fell back to a
REST archive without .git and Get-TestRepoRoot failed. Bootstrap pacman git
first, and accept profile markers / GITHUB_WORKSPACE as repo-root fallbacks.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: bolens

.github/workflows/ci-powershell.yml

@@ -57,6 +57,14 @@ jobs:
     runs-on: ${{ matrix.os }}
     container: ${{ matrix.container }}
     steps:
+      # Arch images ship without git; checkout then uses a REST archive (no .git).
+      - name: Bootstrap Arch git for checkout
+        if: matrix.label == 'arch-latest'
+        shell: bash
+        run: |
+          set -euo pipefail
+          pacman -Sy --noconfirm
+          pacman -S --noconfirm git
       - uses: actions/checkout@v7
       - name: Setup Arch Linux
         if: matrix.label == 'arch-latest'

.github/workflows/test-pester.yml

@@ -92,6 +92,14 @@ jobs:
       fail-fast: false
       matrix: ${{ fromJson(needs.changes.outputs.matrix) }}
     steps:
+      # Arch images ship without git; checkout then uses a REST archive (no .git).
+      - name: Bootstrap Arch git for checkout
+        if: matrix.label == 'arch-latest'
+        shell: bash
+        run: |
+          set -euo pipefail
+          pacman -Sy --noconfirm
+          pacman -S --noconfirm git
       - uses: actions/checkout@v7
       - name: Setup Arch Linux
         if: matrix.label == 'arch-latest'

.github/workflows/validate-profile.yml

@@ -189,6 +189,15 @@ jobs:
             container: archlinux:latest
             powershell: pwsh
     steps:
+      # Arch images ship without git; checkout then uses a REST archive (no .git).
+      - name: Bootstrap Arch git for checkout
+        if: matrix.label == 'arch-latest'
+        shell: bash
+        run: |
+          set -euo pipefail
+          pacman -Sy --noconfirm
+          pacman -S --noconfirm git
+
       - name: Checkout
         uses: actions/checkout@v7
 

tests/TestSupport/TestPaths.ps1

@@ -3,11 +3,40 @@
 # Test path resolution and directory utilities
 # ===============================================
 
+<#
+.SYNOPSIS
+    Returns $true when a directory looks like this repository's root.
+.DESCRIPTION
+    Accepts a real Git checkout (.git present) or an archive-style checkout
+    (profile entrypoint + profile.d), which GitHub Actions uses when git is
+    missing from the job container PATH at checkout time.
+#>
+function Test-TestRepoRootMarker {
+    param(
+        [Parameter(Mandatory)]
+        [string]$Path
+    )
+
+    if ([string]::IsNullOrWhiteSpace($Path)) {
+        return $false
+    }
+
+    if (Test-Path -LiteralPath (Join-Path $Path '.git')) {
+        return $true
+    }
+
+    $profileScript = Join-Path $Path 'Microsoft.PowerShell_profile.ps1'
+    $profileDir = Join-Path $Path 'profile.d'
+    return (Test-Path -LiteralPath $profileScript) -and (Test-Path -LiteralPath $profileDir)
+}
+
 <#
 .SYNOPSIS
     Locates the repository root directory for the tests.
 .DESCRIPTION
-    Walks up from the supplied start path until it finds a .git folder and returns that directory.
+    Prefers GITHUB_WORKSPACE / PS_PROFILE_REPO_ROOT when they point at this repo,
+    then walks up from the supplied start path until it finds a .git entry or the
+    profile markers (archive checkouts without .git).
 .PARAMETER StartPath
     The path to begin searching from; defaults to the calling script root.
 .OUTPUTS
@@ -19,9 +48,16 @@ function Get-TestRepoRoot {
         [string]$StartPath = $PSScriptRoot
     )
 
+    foreach ($envName in @('PS_PROFILE_REPO_ROOT', 'GITHUB_WORKSPACE')) {
+        $candidate = [Environment]::GetEnvironmentVariable($envName)
+        if ($candidate -and (Test-TestRepoRootMarker -Path $candidate)) {
+            return ([System.IO.Path]::GetFullPath($candidate))
+        }
+    }
+
     $current = Get-Item -LiteralPath $StartPath
     while ($null -ne $current) {
-        if (Test-Path -LiteralPath (Join-Path $current.FullName '.git')) {
+        if (Test-TestRepoRootMarker -Path $current.FullName) {
             return $current.FullName
         }
         $current = $current.Parent