Some CI fixes/improvements
- Avoid duplicate pipelines like in tracker-miners, while having a manual escape hatch for starting non-mr pipelines
- Use Fedora "latest" instead of specifying version numbers
- Bump image builds for Fedora/Alpine
- Avoid uncrustify errors in "check-style" phase output
- Allow "test-website" in branches
- Fix Coverity build
Edited by Carlos Garnacho