Trigger CRD docs automation on new releases rather than pushes to main (#548)

* Trigger CRD docs automation on new releases rather than pushes to main

* Use env instead of secrets

* Update dispatch-crd-docs.yml

Author: JakeSCahill

.github/workflows/dispatch-crd-docs.yml

@@ -1,13 +1,12 @@
 ---
 # This workflow triggers the action in redpanda-data/docs that
-# publishes the CRD specifications to the Redpanda documentation.
+# publishes the CRD and Helm chart specifications to the Redpanda documentation.
+# https://github.com/redpanda-data/docs/blob/main/.github/workflows/generate-crd.yml
 
-name: Trigger CRD docs
+name: Trigger Kubernetes reference docs
 on:
-  push:
-    branches: [main]
-    paths:
-      - 'operator/api/**'
+  release:
+    types: [published]
 jobs:
   dispatch:
     runs-on: ubuntu-latest