Linux installer for immutable distros

[Pshemas]

It would be great if the Linux installer could recieve a tweak so it would install on immutable distros like Fedora Silverblue, SteamOS etc.

Currently the installer fails during setup - it copies meshagent binary to required location (as ofc not whole drive is non-writable), but fails when creating config file and service file.

If I craete them manually and copy them to intended lcoations the agent (and the service) works as expected.

[si458]

#5384 #5802