This commit adds an `ExecCondition` directive on the `container-build@`
service, used as a pre-requisite for all other Podman-based services,
skipping `podman build` invocations unless local `Containerfile` or any
files in the `container` sub-directories have changed.
Container builds are responsible for the majority of time taken during
boot, even with cache in place; this will help alleviate pressure and
hopefully speed up boot considerably.
This commit contains a fairly large diff for a fairly small change:
moving the `config/common` directory to `host/base` to better reflect
its intended use, and promoting `config/service` to the root directory.
These changes unlock some improvements in `coreos-home-server-update`
processes, which will (assuming `/etc/coreos-home-server/base` exists)
keep host-wide systemd services in sync in addition to service-specific
ones.
Changes have been make to the `Makefile` and a few other places where
`config/common` was referenced, but most of this work is renames that
are not intended to break compatibility with new or running servers.