allow PR previews to be manually re-run

.github/workflows/build-preview.yml

@@ -4,6 +4,12 @@ on:
   pull_request:
     branches:
       - main
+  workflow_dispatch:
+    inputs:
+      custom_pr_number:
+        description: 'Pull Request number (excluding hashtag symbol)'
+        required: true
+        type: string
 
 permissions:
   contents: read
@@ -42,7 +48,7 @@ jobs:
 
       - name: Store pull request number for later use
         run: |
-          echo ${{github.event.number}} > ./pr_number
+          echo ${{github.event.inputs.custom_pr_number || github.event.number}} > ./pr_number
       - uses: actions/upload-artifact@v4
         with:
           name: pr

.github/workflows/deploy-preview.yml

@@ -10,7 +10,7 @@ jobs:
   deploy-preview:
     environment: pr-previews
     runs-on: ubuntu-latest
-    if: ${{github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'}}
+    if: ${{(github.event.workflow_run.event == 'pull_request' || github.event.workflow_run.event == 'workflow_dispatch') && github.event.workflow_run.conclusion == 'success'}}
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4