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ci: install valgrind from archive.ubuntu.com when the Azure mirror fails #66

Job	Run time
Classify the change	29s
Convert DuckShop within the time budget	-1s
Fuzz tolerant parsing	-1s
Checks, tests and replay	1m 30s
Website	-1s
Verify	3s
Classify the change	33s
Fuzz tolerant parsing	0s
Convert DuckShop within the time budget	0s
Checks, tests and replay	32m 27s
Website	0s
Verify	4s
	35m 3s