allow close-featurebranch to be done through workflow dispatch

.github/workflows/close-featurebranch.yml

@@ -5,6 +5,12 @@ on:
     types: [closed]
     branches:
       - master
+  workflow_dispatch:
+    inputs:
+      BRANCH:
+        type: string
+        description: Which featurebranch branch to destroy?
+        required: true
 
 jobs:
   release:
@@ -13,7 +19,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: passeidireto/trigger-external-workflow-action@main
         env:
-          PAYLOAD_BRANCH: ${{ github.head_ref }}
+          PAYLOAD_BRANCH: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.BRANCH || github.head_ref }}
           PAYLOAD_PR_NUMBER: ${{ github.ref }}
         with:
           repository: budibase/budibase-deploys