As part of the build process, I would like to change the feeds source from git.openwrt.org to github.com. I've already read this doc, but it does not contain current github repos.
The current 23.05.3 feeds.conf.default is as follows (points to git.openwrt.org ):
I just found out that telephony.git is also mirrored in Github. Therefore below is the sed command line to switch the default feeds sourced from git.openwrt.org to github.com. It will create the file feeds.config from the default values in feeds.config.default. The ./scripts/feeds script will use feeds.config (instead of feeds.config.default) if it exists. More details here.
sed -e 's,git.openwrt.org/feed,github.com/openwrt,g; s,git.openwrt.org/project,github.com/openwrt,g' feeds.conf.default > feeds.conf
See below for more details. Marking this post as solution.