Fix running approve snapshots workflow manually

Author: axelboc

.github/workflows/approve-snapshots.yml

@@ -12,6 +12,7 @@ jobs:
 
     steps:
       - name: Get branch name for PR
+        if: github.event_name == 'issue_comment'
         uses: andrevalentin/get-branch-name-by-pr@v1
         id: getBranchName
         with:
@@ -21,7 +22,7 @@ jobs:
       - name: Checkout 🏷️
         uses: actions/checkout@v4
         with:
-          ref: ${{ github.event_name == 'workflow_dispatch' && github.event.ref || steps.getBranchName.outputs.branch }}
+          ref: ${{ steps.getBranchName && steps.getBranchName.outputs.branch || github.event.ref }}
 
       - name: Set up Node 🕹️
         uses: actions/setup-node@v4