build: add run target

This will allow developers to run the application with `ninja -C build run`
without installation.
3 jobs for wip/jtojnar/run in 1 minute and 4 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #328930
flatpak

00:00:40

 
  Deploy
passed #328931
review

00:00:23

manual #328932
allowed to fail manual
stop_review