selinux

[idarlund]

documentation was lacking information on security context to binary which resulted SELinux based distros to deny execution trough service. I've added documentation how to fix this without turning SELinux off.

Closes #3700

[izanbard]

Nice work

[idarlund]

Just to add some more context to this PR. This is the log message you'll see in the audit log if security context on the binary is not set correctly:

type=AVC msg=audit(1724228637.075:372): avc: denied { execute } for pid=36219 comm="(mediamtx)" name="mediamtx" dev="dm-0" ino=135307595 scontext=system_u:system_r:init_t:s0 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=0