[Feature Request] Support for including extra files/artifacts in the distribution package

[eximius313]

Currently, there is no straightforward way in distribute_options.yaml to include non-asset files (like LICENSE.txt, README.md, or third-party configuration files) directly into the root directory of the generated distribution package (e.g., Windows MSI/EXE, Linux DEB).
For desktop applications, including an Open Source License file in the installation directory is a mandatory legal requirement for many packages (e.g., those under LGPL, MIT, or Apache licenses).

Proposal

Please add an extra_files or include section within the package or job configuration in distribute_options.yaml.
This section should allow mapping local files to a destination path within the final build output.

- name: release-windows
        package:
          platform: windows
          target: exe
          # Proposed new section:
          include_files:
            - source: LICENSE_DIST.txt
              destination: OPEN_SOURCE_LICENSES.txt
            - source: docs/manual.pdf
              destination: manual.pdf

Behavior

Specified files are included in the root directory of the generated distribution package

Benefits

This is particularly important for compliance with the LGPL v3 license (often used with C-library wrappers), which requires "prominent notice" and easy access to the license text and the source code location within the distributed software package.