run installations test several times to identify flakes when run alone

Author: dlarocque

.github/workflows/test-changed.yml

@@ -82,7 +82,7 @@ jobs:
 
   test-webkit:
     name: Test Packages With Changed Files in Webkit
-    runs-on: ubuntu-20.04
+    runs-on: macos-latest
 
     steps:
       - name: Checkout Repo
@@ -101,6 +101,16 @@ jobs:
       - name: build
         run: yarn build:changed core
       - name: Run tests on changed packages
-        run: xvfb-run yarn test:changed core
+        run: |
+          yarn test --scope @firebase/installations
+          yarn test --scope @firebase/installations
+          yarn test --scope @firebase/installations
+          yarn test --scope @firebase/installations
+          yarn test --scope @firebase/installations
+          yarn test --scope @firebase/installations
+          yarn test --scope @firebase/installations
+          yarn test --scope @firebase/installations
+          yarn test --scope @firebase/installations
+          yarn test --scope @firebase/installations
         env:
           BROWSERS: 'WebkitHeadless'