fix: pass PR number as input to version-preview workflow

Author: rahul-infra

.github/workflows/terraform.yaml

@@ -30,6 +30,8 @@ jobs:
       contents: read
       pull-requests: write
     uses: ./.github/workflows/version-preview.yaml
+    with:
+      pr_number: ${{ github.event.pull_request.number }}
 
   preCommitCheck:
     name: Terraform Checks

.github/workflows/version-preview.yaml

@@ -2,6 +2,10 @@ name: 'Version Preview'
 
 on:
   workflow_call:
+    inputs:
+      pr_number:
+        required: true
+        type: number
 
 defaults:
   run:
@@ -20,7 +24,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          ref: refs/pull/${{ github.event.pull_request.number }}/merge
+          ref: refs/pull/${{ inputs.pr_number }}/merge
 
       - name: Configure for preview
         run: |