GitHub Actions: Add apt mirror to make package download more robust

- Download of Ubuntu packages from Azure is unstable. Add mirror sites to improve reliability.
- Improve use of clang-format and include source code changes

ApplicationLibCode/Application/RiaThermalFractureDefines.h

@@ -22,8 +22,6 @@
 
 #include <QString>
 
-
-
 namespace RiaDefines
 {
 QString leakoffPressureDropResultName();