Add feature inventory artifacts on push (#13695)

* Generate a feature inventory for every push

* Add diffed features

* Move to push only

.github/workflows/add-push-artifacts.yml

@@ -0,0 +1,27 @@
+name: Add artifacts on push
+
+on:
+  push: []
+
+jobs:
+  test:
+    name: Enumerate and diff features
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0  # get the full repository checkout, not just the inciting commit
+    - uses: actions/setup-node@v2
+      with:
+        node-version: 14.x
+    - run: npm install
+    - run: node ./scripts/enumerate-features.js features.json
+    - run: node ./scripts/diff-features.js --format=json > features.diff.json
+    - uses: actions/upload-artifact@v2
+      with:
+        name: enumerate-features
+        path: features.json
+    - uses: actions/upload-artifact@v2
+      with:
+        name: diff-features
+        path: features.diff.json