Adding an action to invoke webhooks

This will allow external tools to be notified when there are updates on the main branch so they can request the data from the repo

.github/workflows/webhook-caller.yml

@@ -0,0 +1,23 @@
+name: Call Webhooks on Main Push
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  call-webhooks:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check and call webhooks
+        env:
+          WEBHOOK_URLS: ${{ secrets.WEBHOOK_URLS }}
+        run: |
+          if [ -n "$WEBHOOK_URLS" ]; then
+            IFS=',' read -ra URLS <<< "$WEBHOOK_URLS"
+            for url in "${URLS[@]}"; do
+              curl -X POST "$url"
+            done
+          else
+            echo "No webhooks to call."
+          fi