A boring build infrastructure for openwrt and sbc nodes.
For openwrt the node definition is usually a set of /etc/uci-defaults scripts
and a /etc/secrets/env file (stored under secrets).
For sbc nodes a cloud-init based provisioning is used. The NoCloud/None provider is configured with a mime multi-part cloud-init archive. Single cloud-init yaml files may be passed through a golang envsubst like templating to replace secrets on build time.