Updated the copyright year from 2025 to 2026 in alpine-install.func, api.func, and cloud-init.func to reflect the new year. No functional changes were made.
- Fix lxc-attach command in build.func line 1341 to use pct exec for consistency
- Add alternative lxc-attach method for script execution using local files
- Fix FUNCTIONS_FILE_PATH to include core.func, tools.func, and install.func content
- Replace GitHub curl downloads with local file sources in build.func
- Update install.func to work with FUNCTIONS_FILE_PATH approach
- Add support for local config-file.func and alpine-install.func
- Add new install scripts: 2fauth-install.sh and alpine-install.sh
- Add new CT scripts: 2fauth.sh and alpine.sh
This improves script execution reliability and removes dependency on GitHub downloads.
