Move more things into build-args.conf

A few sources of information were moved around/deleted in
https://github.com/coreos/fedora-coreos-config/pull/3978 so let's
adjust our files here that need updating.

build-args.conf

@@ -1,18 +1,14 @@
 # Stream-specific build arguments.
 # Pass to buildah/podman using `--build-arg-file`.
-#
-# This is the base version. This value will get used as a starting point for
-# determining what the actual version should be. It's also the value that gets found
-# and replaced in /usr/lib/os-release.
-BASE_VERSION=44
-# This is the developer default version. In COSA builds or pipeline runs, this will get
-# overridden by versionary.
-VERSION=44.dev
+
+ID=fedora
+NAME=fedora-coreos
+STREAM=rawhide
+DESCRIPTION=Fedora CoreOS rawhide
+VERSION=44
+MUTATE_OS_RELEASE=44
 BUILDER_IMG=quay.io/bootc-devel/fedora-bootc-rawhide-standard@sha256:99622cfadfc5691a0c628a9499f608aa003d1aaf7fd9a90dd26c6aac09365222
 MANIFEST=manifest.yaml
 # XXX: see inject_passwd_group() in build-rootfs
 PASSWD_GROUP_DIR=manifests
-NAME=fedora-coreos
-STREAM=rawhide
-DESCRIPTION=Fedora CoreOS rawhide
 IMAGE_CONFIG=image.yaml

manifest.yaml

@@ -1,13 +1,7 @@
-variables:
-  stream: rawhide
-  prod: false
-
 metadata:
   # tell `cosa build` to default to buildah path
   build_with_buildah: true
 
-releasever: 44
-
 repos:
   - fedora-rawhide