Combine all integTest workflows into 2 workflow runs

- Workflow to run all integTest workflows, allowing use of prior cache entries
- Workflow that starts with empty cache

Both of these use workflow_call to combine the existing workflows.

.github/workflows/integ-test-action-inputs.yml

@@ -0,0 +1,33 @@
+name: Test different action inputs
+
+on:
+  workflow_call:
+    inputs:
+      cache-key-prefix:
+        type: string
+  workflow_dispatch:
+
+env:
+  GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX: action-inputs-${{ inputs.cache-key-prefix }}
+  GRADLE_BUILD_ACTION_CACHE_DEBUG_ENABLED: true
+
+jobs:
+  action-inputs:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Invoke with multi-line arguments
+      uses: ./
+      with:
+        build-root-directory: .github/workflow-samples/groovy-dsl
+        arguments: |
+            --configuration-cache
+            --build-cache
+            -DsystemProperty=FOO
+            -PgradleProperty=BAR
+            test
+            jar