ci: run preview release on demand (#11803)

* ci: run preview release on demand

* Update .github/workflows/preview-release.yml

Co-authored-by: Bjorn Lu <bjornlu.dev@gmail.com>

* run on comments

---------

Co-authored-by: Bjorn Lu <bjornlu.dev@gmail.com>

.github/workflows/dispatch-event.yml

@@ -19,7 +19,7 @@ concurrency:
 env:
   ASTRO_ADAPTERS_REPO: withastro/adapters
   ASTRO_STARLIGHT_REPO: withastro/starlight
-  ASTRO_PUSH_MAIN_EVENT: biome-push-main-event
+  ASTRO_PUSH_MAIN_EVENT: astro-push-main-event
     
 jobs:
   repository-dispatch:

.github/workflows/preview-release.yml

@@ -2,11 +2,8 @@ name: Preview release
 
 on:
   workflow_dispatch:
-  push:
-    branches:
-      - main
-    tags:
-      - '!**' 
+  issue_comment:
+    types: [created] 
   merge_group:
   pull_request:
     paths-ignore:
@@ -33,8 +30,14 @@ env:
 
 jobs:
   preview:
-    name: Publish preview release
+    if: ${{ github.repository_owner == 'withastro' && github.event.issue.pull_request && (startsWith(github.event.comment.body, '!preview')) }}
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+      issues: write
+      pull-requests: write
+    name: Publish preview release
     timeout-minutes: 5
     steps:
       - name: Disable git crlf