Tests

Add options for the Julia binary and project path #970

Job	Run time
Test Python (3, macos-latest, @JuliaPkg)	1m 27s
Test Python (3.9, ubuntu-latest, @JuliaPkg)	1m 44s
Test Python (3, windows-latest, @JuliaPkg)	3m 14s
Test Python (3, ubuntu-latest, @JuliaPkg)	1m 55s
Test Python (3.9, windows-latest, @JuliaPkg)	3m 3s
Test Python (3.9, macos-latest, @JuliaPkg)	2m 25s
Test Python (3, ubuntu-latest, manual)	1m 12s
Test Julia (1, ubuntu-latest, @CondaPkg)	2m 17s
Test Julia (1, macos-latest, @CondaPkg)	3m 50s
Test Julia (1, windows-latest, @CondaPkg)	4m 13s
Test Julia (1.9, windows-latest, @CondaPkg)	3m 6s
Test Julia (1.9, ubuntu-latest, @CondaPkg)	2m 2s
Test Julia (1.9, macos-latest, @CondaPkg)	3m 36s
Test Julia (1, ubuntu-latest, python)	2m 18s
	36m 22s

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