fix: add comment to clarify fetch-depth setting in GitHub Actions workflow

Author: devin-grabtaxi

.github/workflows/insights.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
         with:
-          fetch-depth: 0
+          fetch-depth: 0 # fetch all history so that git log can get all history
 
       - name: Install Node.js
         uses: actions/setup-node@v1