Fix tests

Author: angusmcleod

.github/workflows/plugin-tests.yml

@@ -66,7 +66,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           path: plugins/${{ github.event.repository.name }}
-          ref: "${{ github.base_ref }}"
+          ref: "${{ github.head_ref }}"
           fetch-depth: 1
 
       - name: Setup Git
@@ -135,5 +135,5 @@ jobs:
 
       - name: Plugin QUnit
         if: matrix.build_type == 'frontend'
-        run: QUNIT_SKIP_CORE=1 LOAD_PLUGINS=1 QUNIT_EMBER_CLI=0 bin/rake qunit:test['1200000','/w/qunit']
+        run: LOAD_PLUGINS=1 QUNIT_EMBER_CLI=0 QUNIT_SKIP_CORE=1 bin/rake qunit:test['600000','/w/qunit']
         timeout-minutes: 10