Improve CI test signing & assert expected files (#2137)

.github/workflows/build_windows.yaml

@@ -172,10 +172,19 @@ jobs:
                   # Only set for Nightly builds
                   ED_NIGHTLY: ${{ inputs.version }}
 
-            - name: Check app was signed successfully
-              if: inputs.sign
+            - name: Trust eSigner sandbox cert
+              if: inputs.sign == ''
               run: |
-                  . "$env:SIGNTOOL_PATH" verify /pa (get-item ./dist/squirrel-windows*/*.exe)
+                  Set-StrictMode -Version 'Latest'
+                  Import-Certificate -CertStoreLocation Cert:\LocalMachine\Root -FilePath .github/SSLcom-sandbox.crt
+
+            - name: Check app was signed successfully
+              run: |
+                  Set-StrictMode -Version 'Latest'
+                  Get-ChildItem `
+                      -Recurse dist `
+                      -Include *.exe, *.msi `
+                  | ForEach-Object -Process {. $env:SIGNTOOL_PATH verify /pa $_.FullName; if(!$?) { throw }}
 
             - name: Upload Artifacts
               uses: actions/upload-artifact@v4
@@ -184,3 +193,11 @@ jobs:
                   path: |
                       dist
                   retention-days: 1
+
+            - name: Assert all required files are present
+              run: |
+                  Test-Path './dist/win-*unpacked/Element*.exe'
+                  Test-Path './dist/squirrel-windows*/Element Setup*.exe'
+                  Test-Path './dist/squirrel-windows*/element-desktop-*-full.nupkg'
+                  Test-Path './dist/squirrel-windows*/RELEASES'
+                  Test-Path './dist/Element*.msi'