ignore proto-tests/ for pytest #228

Job	Run time
Tests for downstream project Firedrake	2m 48s
Documentation	1m 33s
Tests for downstream project arraycontext	2m 38s
Conda Examples	1m 51s
Tests for downstream project meshmode	9m 30s
Mypy	1m 29s
Pylint	1m 51s
Tests for downstream project grudge	10m 12s
Conda Pytest (ubuntu-latest)	4m 0s
Tests for downstream project pytential	39m 21s
Conda Pytest with Intel CL	3m 53s
Tests for downstream project pytato	6m 27s
Conda Pytest (macos-latest)	4m 36s
Conda Pytest without arg check	3m 53s
Conda Pytest Twice (for cache behavior)	5m 24s
Ruff	6s
Typos	3s
Validate CITATION.cff	9s
	1h 39m 44s

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