Update cmake.yml: re-enable ubuntu-latest build

Author: ChrisHal

.github/workflows/cmake.yml

@@ -14,7 +14,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [windows-latest, macos-latest]
+        os: [windows-latest, macos-latest, ubuntu-latest]
         # os: [windows-latest, ubuntu-latest, macos-13]
         qt_version: ['6.7.0']
     # The CMake configure and build commands are platform agnostic and should work equally well on Windows or Mac.