9a515f0a55
This specifes two new optional fields for /etc/os-release: IMAGE_VERSION= and IMAGE_ID= that are supposed to identify the image of the current booted system by name and version. This is inspired by the versioning stuff in https://github.com/systemd/mkosi/pull/683. In environments where pre-built images are installed and updated as a whole the existing os-release version/distro identifier are not sufficient to describe the system's version, as they describe only the distro an image is built from, but not the image itself, even if that image is deployed many times on many systems, and even if that image contains more resources than just the RPMs/DEBs. In particular, "mkosi" is a tool for building disk images based on distro RPMs with additional resources dropped in. The combination of all of these together with their versions should also carry an identifier and version, and that's what IMAGE_VERSION= and IMAGE_ID= is supposed to be.
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