Add CI workflow to build CrossBasic on Linux and Windows

[simulanics]

Summary

• add GitHub Actions workflow to build CrossBasic and plugins on Ubuntu and Windows
• install required toolchains (Rust, MinGW, libffi) and run existing build scripts per platform
• upload the release artifacts from each platform for automated releases

Testing

• Not run (workflow only)

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add Boost libraries to Linux build

The Linux matrix job later runs ./build_appserver.sh, which links against -lboost_system -lboost_thread and requires Boost headers, but the Linux dependency step only installs g++ and libffi-dev. There are no Boost libraries in the repo, so on ubuntu-latest the app server link will consistently fail with missing -lboost_*, causing the Linux build to fail every run.

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[chatgpt-codex-connector]

Install Boost toolchain for Windows build

The Windows matrix job calls build_all_windows.bat, which invokes build_appserver.bat linking against Boost static libs (libboost_system-mgw14-mt-s-x64-1_87.a, libboost_thread-mgw14-mt-s-x64-1_87.a). The workflow only installs MinGW and a Rust toolchain and the repository contains no Boost binaries, so on windows-latest the link step will fail with missing Boost libraries and the Windows build will never succeed.

Useful? React with 👍 / 👎.