manifests: drop all keys that no longer have meaning

In a derived container build world, which we've switched to in F43+ [1],
there are a lot of historical RPM-OSTree manifest keys that are essentially
dead configuration (has no effect). If anything isn't explicitly handled
in `build-rootfs` like `recommends:` and `ostree-layers:` then it's
either not important or being handled a different way (like in a
postprocess).

[1] https://github.com/coreos/fedora-coreos-tracker/issues/1969

manifests/coreos-bootc-minimal-plus.yaml

@@ -1,22 +1,5 @@
 # Here we override some key settings from bootc minimal-plus.
 
-# Required by Ignition, and makes the system not compatible with Anaconda.
-# Note this deviates from fedora-bootc and means `systemctl enable` doesn't
-# work in a container build. We'll have to resolve that issue some other way in
-# the future... For more details, see
-# https://github.com/CentOS/centos-bootc/issues/167
-# https://coreos.github.io/rpm-ostree/treefile/#experimental-options
-# This is re-implemented below for the container-native flow. Nuke this once
-# that's the only path we support.
-machineid-compat: false
-
-# This is the historical default and what FCOS currently ships. fedora-bootc
-# uses the new `root` value, but migrating FCOS is not that simple...
-# https://coreos.github.io/rpm-ostree/treefile/#experimental-options
-# This is re-implemented below for the container-native flow. Nuke this once
-# that's the only path we support.
-opt-usrlocal: var
-
 postprocess:
 # Make `/opt and `/usr/local` symlinks.
 # This is the historical default and what FCOS currently ships. fedora-bootc

manifests/fedora-coreos-base.yaml

@@ -61,26 +61,6 @@ conditional-include:
 # Be minimal
 recommends: false
 
-ignore-removed-users:
-  - root
-ignore-removed-groups:
-  - root
-# Add the sudo group to /etc/group
-# This is re-implemented below for the container-native flow. Nuke this once
-# that's the only path we support.
-etc-group-members:
-  - sudo
-
-check-passwd:
-  type: "file"
-  filename: "passwd"
-check-groups:
-  type: "file"
-  filename: "group"
-
-# we can drop this when it's the rpm-ostree default
-rpmdb: sqlite
-
 # ⚠⚠⚠ ONLY TEMPORARY HACKS ALLOWED HERE; ALL ENTRIES NEED TRACKER LINKS ⚠⚠⚠
 # See also the version of this in fedora-coreos.yaml
 postprocess:
@@ -118,7 +98,6 @@ postprocess:
     ln -sf multi-user.target /usr/lib/systemd/system/default.target
 
   # Add the sudo group to /etc/group in container-native flow.
-  # We can nuke `etc-group-members` once this is the only supported path.
   - |
     #!/usr/bin/env bash
     set -xeuo pipefail

manifests/fedora-coreos.yaml

@@ -2,15 +2,6 @@
 # into "official" builds of Fedora CoreOS (such as including `fedora-release-coreos`)
 # or are very "opinionated" like disabling SSH passwords by default.
 
-ref: fedora/${basearch}/coreos/${stream}
-metadata:
-  license: MIT
-  name: fedora-coreos
-  summary: Fedora CoreOS ${stream}
-
-add-commit-metadata:
-  fedora-coreos.stream: ${stream}
-
 include: fedora-coreos-base.yaml
 conditional-include:
   - if: releasever >= 41
@@ -61,7 +52,6 @@ ostree-layers:
   - overlay/15fcos
   - overlay/17fcos-container-signing
 
-automatic-version-prefix: "${releasever}.<date:%Y%m%d>.dev"
 mutate-os-release: "${releasever}"
 
 packages:
@@ -79,15 +69,6 @@ packages:
   # https://github.com/coreos/fedora-coreos-tracker/issues/1567
   - bash-color-prompt
 
-# Add the docker group to /etc/group
-# https://github.com/coreos/fedora-coreos-tracker/issues/2
-# This will be no longer needed when systemd-sysusers has been implemented:
-# https://github.com/projectatomic/rpm-ostree/issues/49
-# This is re-implemented below for the container-native flow. Nuke this once
-# that's the only path we support.
-etc-group-members:
-  - docker
-
 # ⚠⚠⚠ ONLY TEMPORARY HACKS ALLOWED HERE; ALL ENTRIES NEED TRACKER LINKS ⚠⚠⚠
 # See also the version of this in fedora-coreos-base.yaml
 postprocess:
@@ -185,7 +166,6 @@ postprocess:
   # https://github.com/coreos/fedora-coreos-tracker/issues/2
   # This will be no longer needed when systemd-sysusers has been implemented:
   # https://github.com/projectatomic/rpm-ostree/issues/49
-  # We can nuke `etc-group-members` once this is the only path we support.
   - |
     #!/usr/bin/env bash
     set -xeuo pipefail