fix: correct tar archive structure for action cache

The runner expects tar.gz to contain the action directory, not just its contents.

Previous: tar -czf SHA.tar.gz -C /tmp/repo --exclude=.git .
  Result: tar contains files directly (wrong structure)
  Error: 'contains 4 directories'

Fixed: tar -czf SHA.tar.gz -C /tmp {owner}_{repo}
  Result: tar contains one directory named {owner}_{repo}
  Matches runner's expected format

This ensures the runner can properly extract and use cached actions.

Author: jackluo923

cache_github_actions.sh

@@ -27,16 +27,20 @@ cache_action() {
 
   # Clone the repo and get the commit SHA for the ref
   local temp_dir=$(mktemp -d)
-  if ! git clone --depth=1 --branch "$ref" "https://github.com/${owner}/${repo}.git" "$temp_dir" 2>/dev/null; then
+  if ! git clone --depth=1 --branch "$ref" "https://github.com/${owner}/${repo}.git" "$temp_dir/${owner}_${repo}" 2>/dev/null; then
     echo "  ⚠ Warning: Failed to clone ${owner}/${repo}@${ref}, skipping"
     rm -rf "$temp_dir"
     return 0
   fi
 
-  local sha=$(cd "$temp_dir" && git rev-parse HEAD)
+  local sha=$(cd "$temp_dir/${owner}_${repo}" && git rev-parse HEAD)
 
-  # Create tar.gz with the action content (exclude .git)
-  tar -czf "${action_dir}/${sha}.tar.gz" -C "$temp_dir" --exclude=.git .
+  # Remove .git directory to reduce size
+  rm -rf "$temp_dir/${owner}_${repo}/.git"
+
+  # Create tar.gz with the action directory itself (not just its contents)
+  # Runner expects: tar contains one directory named {owner}_{repo}
+  tar -czf "${action_dir}/${sha}.tar.gz" -C "$temp_dir" "${owner}_${repo}"
 
   # Clean up
   rm -rf "$temp_dir"