fix sync

Author: anthony-nhs

.github/workflows/sync_copilot.yml

@@ -1,13 +1,13 @@
 name: Sync copilot instructions
 
 on:
-    workflow_call:
-      inputs:
-        ref:
-          description: 'The branch to sync from the central repository'
-          required: false
-          default: 'main'
-          type: string
+  workflow_call:
+    inputs:
+      ref:
+        description: "The branch to sync from the central repository"
+        required: false
+        default: "main"
+        type: string
 
 jobs:
   sync:
@@ -28,7 +28,7 @@ jobs:
           rm -rf .github/copilot
           git clone \
             --depth 1 \
-            --branch $[BRANCH_NAME}" \
+            --branch "${BRANCH_NAME}" \
             https://github.com/NHSDigital/eps-common-workflows.git tmp
           mv tmp/.github/chatmodes .github/chatmodes
           mv tmp/.github/instructions .github/instructions
@@ -49,4 +49,3 @@ jobs:
           branch-suffix: random
           sign-commits: true
           delete-branch: true
-