[build] allow disabling systemd service unit install #2652
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Add
INSTALL_SYSTEMD_UNIT
which can explicitly be set tofalse
to disable installing the service unit even if systemd is available.If not defined, it defaults to true, i.e. the systemed service unit is created. As a result, this change is backwards compatible: it's required to opt-out of systemd unit installation.
In particular, this is useful for NixOS, where a systemd unit will be created independently from the CMake build.
See also: