If we're running test-execute from the build directory which is under one of the tmpfs-ed directories (i.e. /root or /tmp), test-execute might behave strangely, since in that case manager_new() pins the system systemd-executor binary instead of the build dir one, which may lead to a very confusing test fails (if there's enough difference between the system and built sd-executor binary). Let's account for that and bind-mount the build dir under the tmpfs-ed directory if necessary.
System and Service Manager
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