Fix git clone error by checking if repository already exists and using git pull instead

ubuntu-install.sh

@@ -67,8 +67,15 @@ REPO_URL="https://gitlab.com/trbc-dev/eoy-pdf-sortandmerge.git"
 log_info "Cloning application repository..."
 if command -v git &> /dev/null; then
     sudo apt install -y git
-    git clone "$REPO_URL" .
-    git checkout web-app
+    if [[ -d ".git" ]]; then
+        log_info "Repository already exists, pulling latest changes..."
+        git pull origin web-app
+        git checkout web-app
+    else
+        log_info "Cloning fresh repository..."
+        git clone "$REPO_URL" .
+        git checkout web-app
+    fi
 else
     log_warning "Git not available. Please manually download and extract the application files to $APP_DIR"
     exit 1