Produce LSIF data for each commit for fast/precise code nav

.github/workflows/lsif.yml

@@ -0,0 +1,14 @@
+name: LSIF
+on:
+  - push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Generate LSIF data
+        uses: sourcegraph/lsif-go-action@master
+        with:
+          verbose: "true"
+      - name: Upload LSIF data
+        uses: sourcegraph/lsif-upload-action@master