Really really really quick and extra dirty:

git clone openwrt (probably using openwrt-21.02 branch) symlink dotconfig to .config in the openwrt dir symlink files to files in the openwrt dir make modify docker-build.sh to point to your generated tarball run docker-build.sh

docker-build.sh benchmarks the healthcheck with rfctf-container's tools/bench_healthcheck.sh before its test, and fails if the median pass takes over 100 ms. It expects an rfctf-container checkout in ~/development/rfhs/rfctf-container; set RFCTF_CONTAINER for another.

Tests:

tests/test_rfhs_checker.sh tests the healthcheck, files/usr/sbin/rfhs_checker, in the published image without radios; see tests/README.md. GitHub Actions runs it and ShellCheck (.github/workflows/test.yml).