fix(ci): trigger docs update via workflow_run (#2066)

.github/workflows/trigger_docs_update.yml

@@ -1,13 +1,19 @@
 name: Trigger Docs Update
 
 on:
-  release:
-    types: [published]
+  workflow_run:
+    workflows: ["build"]
+    types:
+      - completed
   workflow_dispatch:
 
 jobs:
   trigger_docs_update:
     runs-on: ubuntu-latest
+    # only run if the 'build' workflow was successful and was triggered by a tag push
+    if: >
+      github.event.workflow_run.conclusion == 'success' &&
+      startsWith(github.event.workflow_run.head_branch, 'refs/tags/v')
     steps:
       - name: Trigger docs workflow
         run: |