This is all the feed url. Choose one depends on your device arch.
src/gz passwall https://github.com/cielpy/openwrt-dist/raw/packages/aarch64_generic
src/gz passwall https://github.com/cielpy/openwrt-dist/raw/packages/mips_24kc
src/gz passwall https://github.com/cielpy/openwrt-dist/raw/packages/x86_64
For Imagebuilder user, choose a url add to repositories.conf, and add cd5844109a8e9dda to your keys folder, if folder exist.
For user who's OpenWrt is running, add feed to /etc/opkg/customfeeds.conf, and add the pub key.
wget https://github.com/cielpy/openwrt-dist/raw/master/cd5844109a8e9dda
opkg-key add cd5844109a8e9dda