Run single matrix job

What's Changed

• Fix bug in service healthchecking that keeps wait-for-it alive for longer than it needs by @firecow in #853
• Throw on error don't settle by @firecow in #858
• Add support for service variables by @repomaa in #863
• Add colon to parallel matrix job name by @firecow in #866
• Parallel service start by @repomaa in #865
• Allow executing single matrix job by @hverlin in #854
• Bugfix resource cleanup by @firecow in #874
• Bugfix multiple ports services by @firecow in #873
• Remove anonymous volumes, when cleaning up containers by @firecow in #875
• Small improvements to --help by @firecow in #878

New Contributors

• @repomaa made their first contribution in #863

Thanks to @FnuGk @hverlin @ecourreges-orange and @moberghammer for contributing as well 🎉

Full Changelog: 4.40.1...4.41.0