Adding an action to invoke webhooks (#78)

* 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

* Addressing some feedback

* Changing the log messages

* Cleaning up log message

* Update .github/workflows/webhook-caller.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update .github/workflows/webhook-caller.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update .github/workflows/webhook-caller.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

.github/workflows/webhook-caller.yml

@@ -0,0 +1,44 @@
+name: Call Webhooks on Main Push
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  actions: none
+  checks: none
+  deployments: none
+  issues: none
+  discussions: none
+  packages: none
+  pull-requests: none
+  repository-projects: none
+  security-events: none
+  statuses: none
+
+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 <<< "$WEBHOOK_URLS"
+            idx=1
+            for url in "${URLS[@]}"; do
+              if [[ "$url" =~ ^https:// ]]; then
+                if ! curl -f --max-time 30 --retry 3 --silent --show-error -X POST -H "User-Agent: webhook-caller" -H "Content-Type: application/json" "$url"; then
+                  echo "Webhook call failed for URL '$url' at index $idx" >&2
+                fi
+              else
+                echo "Skipping invalid webhook URL (must start with https://): '$url' at index $idx" >&2
+              fi
+              idx=$((idx+1))
+            done
+          else
+            echo "No webhooks to call."
+          fi