various CI improvements #138

Job	Run time
test (Core, 1, ubuntu-latest)	12m 51s
test (Core, 1, macos-latest)	9m 9s
test (Core, 1, windows-latest)	13m 39s
test (LinearSolveHYPRE, 1, ubuntu-latest)	2m 48s
test (LinearSolveHYPRE, 1, macos-latest)	1m 29s
test (LinearSolveHYPRE, 1, windows-latest)	3m 36s
test (LinearSolvePardiso, 1, ubuntu-latest)	3m 35s
test (LinearSolvePardiso, 1, macos-latest)	2m 59s
test (LinearSolvePardiso, 1, windows-latest)	5m 36s
test (LinearSolveBandedMatrices, 1, ubuntu-latest)	2m 25s
test (LinearSolveBandedMatrices, 1, macos-latest)	1m 52s
test (LinearSolveBandedMatrices, 1, windows-latest)	3m 48s
	1h 3m 47s

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