ci: avoid building from the same commit in parallel #1509

Job	Run time
config	8s
config	8s
win+VS build	0s
win+VS build	0s
linux32 (daald/ubuntu32:xenial)	11m 13s
linux32 (daald/ubuntu32:xenial)	11m 13s
linux-musl (alpine)	12m 20s
linux-musl (alpine)	12m 20s
pedantic (fedora)	3m 31s
pedantic (fedora)	3m 31s
documentation	4m 52s
documentation	4m 52s
linux-asan (ubuntu-latest)	48m 21s
linux-asan (ubuntu-latest)	48m 21s
linux-clang (ubuntu-latest)	13m 11s
linux-clang (ubuntu-latest)	13m 11s
linux-gcc (ubuntu-20.04)	16m 18s
linux-gcc (ubuntu-20.04)	16m 18s
linux-gcc-default (ubuntu-latest)	13m 31s
linux-gcc-default (ubuntu-latest)	13m 31s
linux-leaks (ubuntu-latest)	12m 32s
linux-leaks (ubuntu-latest)	12m 32s
linux-sha256 (ubuntu-latest)	13m 53s
linux-sha256 (ubuntu-latest)	13m 53s
linux-TEST-vars (ubuntu-20.04)	15m 36s
linux-TEST-vars (ubuntu-20.04)	15m 36s
linux-ubsan (ubuntu-latest)	26m 4s
linux-ubsan (ubuntu-latest)	26m 4s
osx-clang (macos-12)	32m 56s
osx-clang (macos-12)	32m 56s
osx-gcc (macos-12)	2h 41m 34s
osx-gcc (macos-12)	47m 19s
win+VS test	0s
win+VS test	0s
sparse	5m 7s
sparse	5m 7s
static-analysis	7m 15s
static-analysis	7m 15s
win build	8m 6s
win build	8m 6s
win test (1)	10m 5s
win test (1)	10m 5s
win test (2)	9m 0s
win test (2)	9m 0s
win test (0)	10m 57s
win test (0)	10m 57s
win test (3)	8m 47s
win test (3)	8m 47s
win test (5)	4m 50s
win test (5)	4m 50s
win test (4)	13m 33s
win test (4)	13m 33s
win test (6)	8m 37s
win test (6)	8m 37s
win test (7)	12m 46s
win test (7)	12m 46s
win test (8)	15m 54s
win test (8)	15m 54s
win test (9)	6m 29s
win test (9)	6m 29s
	15h 0m 37s

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