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f61ba60bbc
This adds scaffolding to install a stub binary which can optionally be added into the initramfs; prep for us doing real work during setup as we aim to move to the native composefs backend. The binary is *built* but is only installed by a new `Makefile` target, so existing build system users won't pick it up. Our development-only `Dockerfile` gains a build option to use it (and also ensures the initramfs is regenerated). However previously we also discussed moving the fstab logic into the initramfs: https://github.com/bootc-dev/bootc/pull/1113 I might try doing that once this lands. One notable thing is that even this trivial nearly-no-op binary is still 4MB which I think is mostly due to linking in a whole copy of prebuilt rust `std`. In theory we could try going to `#[no_std]` but I don't think it'll be viable once we start doing more here. Probably most practical thing re size is `-Z build-std` + LTO. Signed-off-by: Colin Walters <walters@verbum.org>