Workaround jest non-support of mono repos

The issues in jest specifically are tracked in:
kulshekhar/ts-jest#1343
kulshekhar/ts-jest#1109

.github/workflows/build.yml

@@ -40,7 +40,8 @@ jobs:
       run: ./build_all.ps1
       shell: pwsh
     - name: Test
-      run: yarn test
+      run: ./test_all.ps1
+      shell: pwsh
 
     - name: Stamping NPM versions
       run: .github/workflows/set_version.ps1 -Version ${{ steps.nbgv.outputs.NpmPackageVersion }}

test_all.ps1

@@ -0,0 +1,26 @@
+# This script is necessary until https://github.com/kulshekhar/ts-jest/issues/1343 is fixed.
+# In particular, we need this addressed: https://github.com/kulshekhar/ts-jest/issues/1109
+
+$testOrder = Get-ChildItem "$PSScriptRoot\*cloudbuild-task-*" -Directory
+
+$failed = $false
+$testOrder | % {
+	Write-Host -ForegroundColor Blue "Testing $($_.BaseName)"
+	Push-Location $_
+	try {
+		yarn jest
+		if ($LASTEXITCODE -ne 0) {
+			$failed = $true
+		}
+	}
+	finally {
+		Pop-Location
+	}
+}
+
+if ($failed) {
+	Write-Host -ForegroundColor Red "Overall test run failure"
+	exit 1
+} else {
+	Write-Host -ForegroundColor Green "All tests passed!"
+}