Remote creates files under root
Since OpenWrt 21.02, mosquitto runs under its own user, thus means it is no longer uses root and mosquitto can not read root files.
It fails with following error:
Error: Unable to load server key file "/etc/ssl/ca/remote/01.key". Check keyfile.
It helps to chown all files in remote folder as mosquitto and then it works.
Supersedes issue: turris/os/build#289 (closed)