fix "fatal: couldn't find remote ref master"

builder.sh

@@ -47,7 +47,26 @@ update_patches() {
         echo "Patches directory already exists. Cleaning and pulling updates..."
         cd "$PATCHES_DIR" || { echo "Failed to navigate to patches directory. Exiting."; exit 1; }
         git clean -xdf || { echo "Failed to clean patches directory. Exiting."; exit 1; }
-        git pull origin master || { echo "Failed to pull updates from patches repository. Exiting."; exit 1; }
+        
+        # Stash any local changes to ensure a clean rebase
+        git stash push --include-untracked || { echo "Failed to stash local changes. Exiting."; exit 1; }
+        
+        # Fetching all branches
+        git fetch || { echo "Failed to fetch updates from patches repository. Exiting."; exit 1; }
+        
+        # Trying to rebase onto 'main' branch
+        if git show-ref --verify --quiet refs/heads/main; then
+            git rebase origin/main || { echo "Failed to rebase updates from main branch. Exiting."; exit 1; }
+        elif git show-ref --verify --quiet refs/heads/master; then
+            # Fallback to 'master' branch if 'main' does not exist
+            git rebase origin/master || { echo "Failed to rebase updates from master branch. Exiting."; exit 1; }
+        else
+            echo "No valid branch (main or master) found in patches repository. Exiting."
+            exit 1
+        fi
+
+        # Drop stashed changes to discard local modifications
+        git stash drop || { echo "Failed to drop stashed changes. Exiting."; exit 1; }
     else
         echo "Patches directory does not exist. Cloning repository..."
         git clone "$PATCHES_REPO" "$PATCHES_DIR" || { echo "Failed to clone patches repository. Exiting."; exit 1; }