root@gw:/etc/config# df -hT
Filesystem           Type            Size      Used Available Use% Mounted on
/dev/root            squashfs        7.8M      7.8M         0 100% /rom
tmpfs                tmpfs         121.4M      3.3M    118.1M   3% /tmp
/dev/mtdblock6       jffs2           4.8M      1.1M      3.7M  22% /overlay
overlayfs:/overlay   overlay         4.8M      1.1M      3.7M  22% /
tmpfs                tmpfs         512.0K         0    512.0K   0% /dev
root@gw:/etc/config# apk add https-dns-proxy
(1/1) Installing dns-over-https (2.3.0-r2)
ERROR: dns-over-https-2.3.0-r2: failed to extract usr/sbin/doh-server: No space left on device
ERROR: dns-over-https-2.3.0-r2: No space left on device
1 error; 29.6 MiB in 263 packages