An "Operating system not supported" suddenly appears

[woytek]

FWIW, I have a similar issue: A windows build I have been testing suddenly started building only under linux today, but it was starting a windows build environment as of yesterday evening.

Windows build specified in matrix--being ignored and a default linux build is running instead

I have a simple build matrix that I’ve been using to attempt a windows build as I iron out the process for some more complex builds. It looks like this: matrix: include: - os: windows env: BUILD_NAME=windows_test This has been working fine for over a week. Today, it suddenly reverts to building just a linux build. The website says that there is a warning: No os: at the root level, so it defaults to linux. I reconfigured the build so that os: windows was at the root level instead and r…