OpenWRT Snapshot builds using GitHub actions

The builds include the following custom files:

1. updater/

   • check_for_updates.sh: Triggers an update check with openwrt server, if a new update is found, the router triggers a new build on GitHub in this repository. Requires a valid ssh key to work. Hence, fork it, and add the routers ssh key to your account. All files except this one should work on any router.
   • autoupdate.sh: Checks if a new build is available on GitHub. If there is, downloads the build and its sha256, calculates sha256 manually, compares, and finally runs sysupgrade if the comparison is successful.
   • first_boot.sh: Copied to uci-defaults before reboot by autoupdate.sh. Writes an "upgrade successful" message to /root/upgrade.log after first boot.

2. setup/ (only on c6u for now)

   • first_stage.sh: Formats the external usb, and prepares extroot.
   • second_stage.sh: Installs a few additional packages, and enables a bunch of services that I require.
   • z_setup_*_stage: Executes the actual *_stage.sh script after being started by sysctl. z_setup_first_stage is enabled in very first boot.

   These scripts also disable themselves after their respective work is done.

All logs are written to /root/upgrade.log. Make sure to preserve the file if you want.