Add CI step for compiling and testing godot-cpp

[BastiaanOlij]

Adding CI steps here to check if the changes result in a compile-able godot-cpp.
We do this by extracting a new extension_api.json file and attempting to compile godot-cpp with it.

We'll stick to compiling everything for now, once Godot is stable we'll look into checking if we have problematic edits in the extension_api.json file and maybe see about a test extension we can actually run in CI.

[akien-mga]

It seems to stall on "Check for extension api updates", no idea why.

[fire]

Maybe try ${{ matrix.bin }} --headless --dump-extension-api 2>&1 > /dev/null || true

[akien-mga]

Maybe try ${{ matrix.bin }} --headless --dump-extension-api 2>&1 > /dev/null || true

Yes, and then the whole shebang to use a software Vulkan renderer and xvfb is not needed.

I don't think it will solve the issue though, @qarmin seems to have the same issue on #47600 (comment)

[BastiaanOlij]

thats weird, it ran the last time, wonder why it stopped this time

[BastiaanOlij]

Maybe try ${{ matrix.bin }} --headless --dump-extension-api 2>&1 > /dev/null || true

This gives a display error, weird...

[BastiaanOlij]

@akien-mga I'm stuck, it again just stalled on executing the dump, I went back to running it with swift shader, running it headless I got a display ID error.

The time it worked I had an ls after running it. I'm going to try one more thing, re-ordering what I'm doing so I can combine the copy commands. Maybe because we're not giving any output it gets stuck on that.

edit ok, I'm now checking out godot-cpp before building the extension api and calling a python script that doesn't do anything afterwards.
That script we can later on use to compare the old and new api.

[akien-mga]

Now building fine 👍

It adds ~7 min to the build, we'll want to look into having caching for the godot-cpp build too to speed this up on incremental rebuilds.

[akien-mga]

Thanks!