split serve and test scripts

Author: Tom Pearson

.github/workflows/pa11y.yml

@@ -17,10 +17,13 @@ jobs:
         uses: actions/checkout@v2
         with:
           ref: ${{ github.head_ref }}
-      - name: Run pa11y
+      - name: Serve the site
         run: |
           npm i
-          npm test
+          npm run serve
+      - name: A11y test
+        run: |
+          npm run a11y
       - name: Commit report
         if: ${{ always() }}
         run: |