Clean PR preview sites from gh-pages branch history (#6161)

scripts/clean-gh-pages.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+set -e  # Exit on error
+
+echo "Starting gh-pages branch cleanup..."
+
+REMOVE_PATHS_FILE="/tmp/remove-paths.txt"
+> "$REMOVE_PATHS_FILE"
+
+dirs_with_visible_files=$(git ls-tree -r origin/gh-pages:pr-preview --name-only 2>/dev/null | \
+    grep -v '/\.' | \
+    cut -d/ -f1 | \
+    sort -u || true)
+
+all_dirs=$(git ls-tree -d origin/gh-pages:pr-preview --name-only 2>/dev/null || true)
+
+if [ -z "$all_dirs" ]; then
+    echo "No directories found in pr-preview or pr-preview does not exist"
+    rm "$REMOVE_PATHS_FILE"
+    exit 0
+fi
+
+while IFS= read -r dir; do
+    if [ -n "$dir" ]; then
+        if ! echo "$dirs_with_visible_files" | grep -q "^${dir}$"; then
+            dir_path="pr-preview/$dir"
+            echo "Found directory to remove: $dir_path"
+            echo "$dir_path" >> "$REMOVE_PATHS_FILE"
+        fi
+    fi
+done <<< "$all_dirs"
+
+if [ ! -s "$REMOVE_PATHS_FILE" ]; then
+    echo "No empty or hidden-file-only directories found. Nothing to clean up."
+    rm "$REMOVE_PATHS_FILE"
+    exit 0
+fi
+
+uvx git-filter-repo@2.47.0 --paths-from-file "$REMOVE_PATHS_FILE" --invert-paths --refs origin/gh-pages