ci: trigger CI via comment and label (#11849)

* ci: trigger CI via comment and label

* fix: reduce parenthesis

.github/workflows/preview-comment.yml

@@ -0,0 +1,19 @@
+name: Add continuous release label
+
+on:
+  issue_comment:
+    types: [created]
+
+permissions:
+  pull-requests: write
+
+jobs:
+  label:
+    if: ${{ github.repository_owner == 'withastro' && startsWith(github.event.comment.body, '!preview') }}
+    runs-on: ubuntu-latest
+
+    steps:
+      - run: |
+          gh issue edit ${{ github.event.issue.number }} --add-label "pr: preview" --repo ${{ github.repository }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/preview-release.yml

@@ -1,18 +1,18 @@
 name: Preview release
 
 on:
-  workflow_dispatch:
-  issue_comment:
-    types: [created] 
+  pull_request:
+    branches: [main]
+    types: [opened, synchronize, labeled, ready_for_review]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number }}
+  cancel-in-progress: true
 
 permissions:
   contents: read
   actions: write
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
 env:
   TURBO_TOKEN: ${{ secrets.TURBO_TOKEN }}
   TURBO_TEAM: ${{ secrets.TURBO_TEAM }}
@@ -24,7 +24,8 @@ env:
 
 jobs:
   preview:
-    if: ${{ github.repository_owner == 'withastro' && github.event.issue.pull_request && (startsWith(github.event.comment.body, '!preview')) }}
+    if: |
+      ${{ github.repository_owner == 'withastro' && github.event.issue.pull_request && contains(github.event.pull_request.labels.*.name, 'pr: preview') }}
     runs-on: ubuntu-latest
     permissions:
       contents: read