[CI] fix SAUCE_ACCESS_KEY check (#8910)

azure-pipelines.yml

@@ -105,11 +105,15 @@ stages:
             condition: and(succeeded(), variables['APT_PACKAGES'])
             displayName: Install apt packages
           - script: haxe RunCi.hxml
+            condition: and(succeeded(), not(and(variables['SAUCE'], variables['SAUCE_ACCESS_KEY'])))
             workingDirectory: $(Build.SourcesDirectory)/tests
-            env:
-              ${{ if variables['SAUCE_ACCESS_KEY'] }}:
-                SAUCE_ACCESS_KEY: $(SAUCE_ACCESS_KEY)
             displayName: Test
+          - script: haxe RunCi.hxml
+            condition: and(succeeded(), variables['SAUCE'], variables['SAUCE_ACCESS_KEY'])
+            workingDirectory: $(Build.SourcesDirectory)/tests
+            env:
+              SAUCE_ACCESS_KEY: $(SAUCE_ACCESS_KEY)
+            displayName: Test (with SauceLabs)
 
       - job: TestMac
         dependsOn: BuildMac