fix(github): try using runner.os? matrix.os == 'windows-latest' is just a skip

.github/workflows/push.yml

@@ -40,7 +40,7 @@ jobs:
         with:
           submodules: recursive
       - name: Install dependencies (Ubuntu)
-        if: runner.os == 'Windows'
+        if: runner.os == 'Ubuntu'
         run: |
           sudo apt update
           sudo apt install -y libopengl-dev libglx-dev libxext-dev libglvnd-dev