ci: Use tmpdir in the build path as temporary path
As in commit b028f276 tmpfs may be limited, leading us to problems in some tests.
And having this seems to solve a timeout issue we may have under valgrind in CI.
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As in commit b028f276 tmpfs may be limited, leading us to problems in some tests.
And having this seems to solve a timeout issue we may have under valgrind in CI.