Update workflow version

Author: gdonald

.github/workflows/raku.yml

@@ -1,12 +1,9 @@
-on: [push]
-
+on: [ push, pull_request ]
 jobs:
   test:
     runs-on: ubuntu-latest
-    name: Tests
     steps:
-    - name: Checkout
-      uses: actions/checkout@v2
-    - name: Runs tests
-      id: tests
-      uses: JJ/raku-container-action@master
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Test via install
+        uses: JJ/raku-test-action@main