Fixed rpm build producing 0badc0de as revision
Also changed checksums to output to the same file with a txt extension
Signed-off-by: Jamie Newbon <jamie@symless.com>
* Added Ubuntu Dockers for 16, 18, and 19
* Added Cirrus CI build task for gcloud instance with SSDs
* Added macOS instance build with brew Qt install
* Fixed Qt headers for 5.12.2 used in Ubuntu 19.04
* Consolidated version info into CMake file