ci: add GitHub Actions workflow for build and release

[gautamkrishnar]

Summary

• Adds a GitHub Actions workflow that assembles trpad.asm with MASM32 and links with Crinkler to produce trpad.exe
• Build artifact (trpad.exe) is downloadable from every workflow run
• Automatically creates a GitHub Release with trpad.exe attached when a version tag (v*) is pushed

How it works

• MASM32 SDK is installed via two-stage 7z extraction from the official installer (no commandline flag was available to do non interactive installation)
• Crinkler v3.0a is downloaded from its GitHub releases
• Windows SDK lib path is resolved dynamically from the runner
• Generates QR Code for the entrire EXE

Example Zip file with exe download: https://github.com/gautamkrishnar/TinyRetroPad/actions/runs/28610708506

[Gunzinger]

This seems like great fun 😄
I just spent some time trying to create and minimize a QR code from the resulting crushed binary, as the current trpad.exe binary (2794B) is slightly below the maximum binary content size of a QR code (2953B with v40, 2809B with v39 used here);

This is the smallest I could get (4036B of PNG for the currently latest version of trpad.exe [2794B]), I had no luck getting even smaller versions with webp/avif and wanted to keep at least one pixel wide border/margin.

Since this only requires qrencode and oxipng it might be fun to integrate it into the CI pipeline in the release job;

I used:

qrencode -o trpad.png -s 1 -m 1 -8 -r trpad.exe
oxipng -o max -z -f 9 --strip all trpad.png

Note that most QR code readers seem to assume UTF8 when decoding, I had to use zxing-cpp to properly decode the QR code back to binary format, available from e.g. ubuntu package zxing-cpp-tools:

> ZXingReader -bytes trpad.png > trpad-roundtrip.exe
> sha256sum trpad.exe
3079f188d92f99e7f7c807c367c2af4d3f78a547e6c2813eddf18346bc01c578  trpad.exe
> sha256sum trpad-roundtrip.exe
3079f188d92f99e7f7c807c367c2af4d3f78a547e6c2813eddf18346bc01c578  trpad-roundtrip.exe

[gautamkrishnar]

@Gunzinger thanks for the suggestion, just added QR code generation as well 🤝