chore: macos support for generate-changelog.sh (#14583)

scripts/generate-changelog.sh

@@ -7,22 +7,25 @@ copy_tools=("xclip" "wl-copy" "pbcopy")
 
 # Find the first available tool
 for tool in "${copy_tools[@]}"; do
-    if command -v "$tool" > /dev/null 2>&1; then
-        selected_tool="$tool"
-        break
-    fi
+  if command -v "$tool" >/dev/null 2>&1; then
+    selected_tool="$tool"
+    break
+  fi
 done
 
 # Check if a tool was found
 if [[ -z "$selected_tool" ]]; then
-    echo "No suitable copy tool found. Please install xclip, wl-copy, or pbcopy."
-    exit 1
+  echo "No suitable copy tool found. Please install xclip, wl-copy, or pbcopy."
+  exit 1
 fi
 
 git fetch
 
 # Get two most recent release branches
-mapfile -t branches < <(git for-each-ref --sort=-committerdate refs/heads/release/ --format='%(refname:short)' | head -n2)
+branches=()
+while IFS= read -r line; do
+  branches+=("$line")
+done < <(git for-each-ref --sort=-committerdate refs/heads/release/ --format='%(refname:short)' | head -n2)
 npx generate-changelog -t "${branches[1]}".."${branches[0]}" -a -f - | $selected_tool
 
 echo "Changelog copied to clipboard using $selected_tool"