cmake: move os-release parsing into oci branch #3052
Merged
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os-release parsing is only needed for OCI usage, so move it inside the appropriate branch. Saves some operations at build time when not needed, and also it is necessary as not all OSes define VERSION_ID (e.g.: Debian Unstable and Archlinux), so doing the parsing in the main block breaks the build. By moving it inside the OCI block, it runs only when needed.