Probably nothing critical, it’ll take a while until /tmp will be full, but after each pkgupdate there is 28 orphaned files updater-sig-XXXXXX in /tmp (where XXXXXX is random).
evidence
root@omnia:~#
root@omnia:~# ls -1 /tmp/updater-sig-* | wc -l
ls: /tmp/updater-sig-*: No such file or directory
0
root@omnia:~# pkgupdate
INFO:Target Turris OS: 5.0.0
WARN:Package wpad is in cyclic dependency. It might fail its post-install script.
WARN:Package hostapd is in cyclic dependency. It might fail its post-install script.
WARN:Requested package luci-i18n-rainbow-en that is missing, ignoring as requested.
WARN:Requested package luci-i18n-sqm-en that is missing, ignoring as requested.
WARN:Requested package luci-i18n-rainbow-cs that is missing, ignoring as requested.
WARN:Requested package luci-i18n-sqm-cs that is missing, ignoring as requested.
root@omnia:~#
root@omnia:~# ls -1 /tmp/updater-sig-* | wc -l
28
root@omnia:~# pkgupdate
INFO:Target Turris OS: 5.0.0
WARN:Package wpad is in cyclic dependency. It might fail its post-install script.
WARN:Package hostapd is in cyclic dependency. It might fail its post-install script.
WARN:Requested package luci-i18n-rainbow-en that is missing, ignoring as requested.
WARN:Requested package luci-i18n-sqm-en that is missing, ignoring as requested.
WARN:Requested package luci-i18n-rainbow-cs that is missing, ignoring as requested.
WARN:Requested package luci-i18n-sqm-cs that is missing, ignoring as requested.
root@omnia:~#
root@omnia:~# ls -1 /tmp/updater-sig-* | wc -l
56
root@omnia:~# pkgupdate
INFO:Target Turris OS: 5.0.0
WARN:Package wpad is in cyclic dependency. It might fail its post-install script.
WARN:Package hostapd is in cyclic dependency. It might fail its post-install script.
WARN:Requested package luci-i18n-rainbow-en that is missing, ignoring as requested.
WARN:Requested package luci-i18n-sqm-en that is missing, ignoring as requested.
WARN:Requested package luci-i18n-rainbow-cs that is missing, ignoring as requested.
WARN:Requested package luci-i18n-sqm-cs that is missing, ignoring as requested.
root@omnia:~#
root@omnia:~# ls -1 /tmp/updater-sig-* | wc -l
84
root@omnia:~#