Report the cache as disabled when Gradle User Home exists

Fixes #434

.github/workflows/demo-job-summary.yml

@@ -41,3 +41,25 @@ jobs:
       working-directory: .github/workflow-samples/groovy-dsl
       continue-on-error: true
       run: ./gradlew not-a-real-task
+
+  pre-existing-gradle-home:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v3
+    - name: Build distribution
+      shell: bash
+      run: |
+        npm install
+        npm run build
+    - name: Pre-create Gradle User Home
+      shell: bash
+      run: |
+        mkdir ~/.gradle
+        mkdir ~/.gradle/caches
+        touch ~/.gradle/caches/dummy.txt
+    - name: Setup Gradle
+      uses: ./
+    - name: Run build
+      working-directory: .github/workflow-samples/groovy-dsl
+      run: ./gradlew assemble