add and use pixi task #2281

Job	Run time
Build	1m 58s
Check format	1m 13s
Smoke test	5m 55s
Extended testing (ubuntu-22.04)	18m 12s
Test GNU fortran (macos-13, false)	53m 45s
Test Intel fortran (ubuntu-22.04)	40m 43s
Test GNU fortran (macos-14, false)	33m 20s
Test Intel fortran (macos-13)	29m 14s
Test GNU fortran (macos-14, true)	1h 5m 14s
Test Intel fortran (windows-2022)	1h 11m 28s
Extended testing (macos-13)	40m 12s
Test GNU fortran (ubuntu-22.04, false)	39m 50s
Extended testing (windows-2022)	9m 41s
Test GNU fortran (ubuntu-22.04, true)	1h 32m 22s
Test GNU fortran (windows-2022, false)	43m 18s
	9h 6m 25s

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