try it in ubuntu

Author: Pxtl

.github/workflows/validate-powershell.yml

@@ -30,7 +30,7 @@ jobs:
       contents: read # for actions/checkout to fetch code
       security-events: write # for github/codeql-action/upload-sarif to upload SARIF results
       actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
 
@@ -52,12 +52,12 @@ jobs:
           sarif_file: results.sarif
 
       - name: Install Pester
-        shell: powershell
+        shell: pwsh
         run: |
           Install-Module -Name Pester -Force -Scope CurrentUser
 
       - name: Run Pester Unit Tests
-        shell: powershell
+        shell: pwsh
         run: |
           $modules = Get-ChildItem -Directory -Path ./src
           foreach ($module in $modules) {
@@ -71,7 +71,7 @@ jobs:
           }
 
       - name: Run Pester ADServices Integration Tests
-        shell: powershell
+        shell: pwsh
         run: |
           $Server = 'localhost:389'
           $PSCredential = [PSCredential]::new('Administrator', (ConvertTo-SecureString 'Passw0rd' -AsPlainText -Force))