Run test builds on Ubuntu and Windows

- Remove MacOS since the agents are current flaky
- Add Windows to a few more test pipelines

.github/workflows/integTest-gradle-user-home.yml

@@ -13,7 +13,10 @@ jobs:
   # Run initial Gradle builds to push initial cache entries
   # These builds should start fresh without cache hits, due to the seed injected into the cache key above.
   seed-build:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout sources
       uses: actions/checkout@v2
@@ -26,7 +29,10 @@ jobs:
   # Test that the gradle-user-home cache will cache dependencies, by running build with --offline
   dependencies-cache:
     needs: seed-build
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout sources
       uses: actions/checkout@v2
@@ -40,7 +46,10 @@ jobs:
   # Test that the gradle-user-home cache will cache and restore local build-cache
   build-cache:
     needs: seed-build
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout sources
       uses: actions/checkout@v2