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/ci-verify-outputs.yml

@@ -0,0 +1,33 @@
+name: Verify generated outputs
+
+on:
+  pull_request:
+    types: [assigned, review_requested]
+  push:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Build
+      run: |
+        npm install
+        npm run all
+
+    - name: Compare the expected and actual dist/ directories
+      run: |
+        if [ "$(git diff --ignore-space-at-eol dist/ | wc -l)" -gt "0" ]; then
+          echo "Detected uncommitted changes after build.  See status below:"
+          git diff
+          exit 1
+        fi
+      id: diff
+
+    # If index.js was different than expected, upload the expected version as an artifact
+    - uses: actions/upload-artifact@v2
+      if: ${{ failure() && steps.diff.conclusion == 'failure' }}
+      with:
+        name: dist
+        path: dist/