ci: of course also install igraph itself #1835

Job	Run time
Build wheels on Linux (aarch64/manylinux)	10m 56s
Build wheels on Linux (x86_64)	19m 47s
Build wheels on macOS (x86_64)	14m 24s
Build wheels on Linux (aarch64/musllinux)	5m 55s
Build wheels on macOS (arm64)	7m 42s
Build wheels on Windows (x64)	24m 52s
Build wheels on Windows (Win32)	12m 9s
Build wheels for WebAssembly	7m 5s
Build wheels on Windows (ARM64)	14m 35s
Build with sanitizers for debugging purposes	3m 32s
Build sdist and test extra dependencies	3m 15s
Build wheels on Linux (aarch64/musllinux)	5m 16s
Build wheels for WebAssembly	7m 5s
Build wheels on Windows (Win32)	12m 9s
Build wheels on Linux (aarch64/manylinux)	10m 56s
Build wheels on Linux (x86_64)	19m 47s
Build wheels on macOS (x86_64)	14m 24s
Build wheels on Windows (ARM64)	14m 35s
Build sdist and test extra dependencies	3m 15s
Build wheels on Windows (x64)	24m 52s
Build with sanitizers for debugging purposes	3m 32s
Build wheels on macOS (arm64)	7m 42s
	4h 7m 45s

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