c_cpp_properties.json

{
    "configurations": [
        {
            "name": "Mac",
            "includePath": [
                "/usr/local/Cellar/arm-gcc-bin@8/8-2019-q3-update_1/arm-none-eabi/include/**",
                "/usr/local/Cellar/arm-gcc-bin@8/8-2019-q3-update_1/lib/gcc/arm-none-eabi/8.3.1/include/**",
                "/usr/local/Cellar/arm-gcc-bin@8/8-2019-q3-update_1/lib/gcc/arm-none-eabi/8.3.1/include-fixed/**",
                "/usr/local/Cellar/avr-gcc@8/8.4.0_2/avr/include/**",
                "/usr/local/Cellar/avr-gcc@8/8.4.0_2/lib/avr-gcc/8/gcc/avr/8.4.0/include/**",
                "/usr/local/Cellar/avr-gcc@8/8.4.0_2/lib/avr-gcc/8/gcc/avr/8.4.0/include-fixed/**",
                "/usr/local/include/**",
                "${workspaceFolder}"
            ],
            "defines": [
                "QMK_KEYBOARD_H=<quantum.h>"
            ],
            "intelliSenseMode": "clang-x64",
            "browse": {
                "path": [
                    "/usr/include",
                    "/usr/local/include",
                    "${workspaceFolder}"
                ],
                "limitSymbolsToIncludedHeaders": false,
                "databaseFilename": ""
            },
            "macFrameworkPath": [
                "/System/Library/Frameworks",
                "/Library/Frameworks"
            ]
        },
        {
            "name": "Linux",
            "includePath": [
                "/usr/include",
                "/usr/local/include",
                "${workspaceFolder}"
            ],
            "defines": [
                "QMK_KEYBOARD_H=<quantum.h>"
            ],
            "intelliSenseMode": "clang-x64",
            "browse": {
                "path": [
                    "/usr/include",
                    "/usr/local/include",
                    "${workspaceFolder}"
                ],
                "limitSymbolsToIncludedHeaders": false,
                "databaseFilename": ""
            }
        },
        {
            "name": "Win32",
            "includePath": [
                "C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.12.25827/include/*",
                "C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.12.25827/atlmfc/include/*",
                "C:/Program Files (x86)/Windows Kits/10/Include/10.0.16299.0/um",
                "C:/Program Files (x86)/Windows Kits/10/Include/10.0.16299.0/ucrt",
                "C:/Program Files (x86)/Windows Kits/10/Include/10.0.16299.0/shared",
                "C:/Program Files (x86)/Windows Kits/10/Include/10.0.16299.0/winrt",
                "C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.13.26128/include",
                "C:/msys64/mingw64/avr/include/**",
                "C:/msys64/mingw64/lib/gcc/avr/8.4.0/include/**",
                "C:/msys64/mingw64/lib/gcc/avr/8.4.0/include-fixed/**",
                "C:/msys64/mingw64/arm-none-eabi/include/**",
                "C:/msys64/mingw64/lib/gcc/arm-none-eabi/10.1.0/include/**",
                "C:/msys64/mingw64/lib/gcc/arm-none-eabi/10.1.0/include-fixed/**",
                "C:/QMK_MSYS/mingw64/avr/include/**",
                "C:/QMK_MSYS/mingw64/arm-none-eabi/include/**",
                "C:/QMK_MSYS/mingw64/lib/gcc/avr/8.4.0/include/**",
                "C:/QMK_MSYS/mingw64/lib/gcc/avr/8.4.0/include-fixed/**",
                "C:/QMK_MSYS/mingw64/lib/gcc/arm-none-eabi/10.1.0/include/**",
                "C:/QMK_MSYS/mingw64/lib/gcc/arm-none-eabi/10.1.0/include-fixed/**",
                "${workspaceFolder}/**",
                "${workspaceFolder}/quantum/**",
                "${workspaceFolder}/tmk_core/common/**",
                "${workspaceFolder}/quantum/audio/**",
                "${workspaceFolder}/quantum/process_keycode/**",
                "${workspaceFolder}/drivers/avr/**",
                "${workspaceFolder}/lib/chibios/**",
                "${workspaceFolder}/lib/lufa/**"
            ],
            "defines": [
                "QMK_KEYBOARD_H=<quantum.h>"
            ],
            "intelliSenseMode": "msvc-x64",
            "browse": {
                "path": [
                    "C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.12.25827/include/*",
                    "C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.12.25827/atlmfc/include/*",
                    "C:/Program Files (x86)/Windows Kits/10/Include/10.0.16299.0/um",
                    "C:/Program Files (x86)/Windows Kits/10/Include/10.0.16299.0/ucrt",
                    "C:/Program Files (x86)/Windows Kits/10/Include/10.0.16299.0/shared",
                    "C:/Program Files (x86)/Windows Kits/10/Include/10.0.16299.0/winrt",
                    "${workspaceFolder}"
                ],
                "limitSymbolsToIncludedHeaders": false,
                "databaseFilename": ""
            },
            "cStandard": "c11",
            "cppStandard": "c++17"
        }
    ],
    "version": 4
}

I had to use the below config (for Windows).

I recommend getting this download of VS build tools: https://visualstudio.microsoft.com/downloads/#build-tools-for-visual-studio-2022 Tick "Desktop development with C++" and make sure to select "C++ ATL for latest..." under "Optional" on the right side.

https://gist.github.com/AllySummers/5c272184ad991f33838b9ff641cd8b51

Where did you put c_cpp_properties.json file? Root level of repository? Does this work out of the box with GitHub actions?