extensions.yaml: New declarative file for extensions

extensions.yaml

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+# RPMs as operating system extensions, distinct from the base ostree commit/image
+# https://github.com/openshift/enhancements/blob/master/enhancements/rhcos/extensions.md
+# and https://github.com/coreos/fedora-coreos-tracker/issues/401
+# We currently explicitly list dependencies for each extension; see
+# https://github.com/coreos/rpm-ostree/issues/2055
+
+extensions:
+  # https://github.com/coreos/fedora-coreos-tracker/issues/326
+  usbguard:
+    packages:
+      - usbguard
+      - libqb
+      - protobuf
+  # kernel-devel
+  # https://github.com/kmods-via-containers/kmods-via-containers/issues/3
+  # https://gitlab.cee.redhat.com/coreos/redhat-coreos/merge_requests/866
+  kernel-devel:
+    packages:
+      - kernel-devel
+      - kernel-core
+      - kernel-headers
+      - kernel-modules
+      - kernel-modules-extra
+  # GRPA-2822
+  # https://github.com/openshift/machine-config-operator/pull/1330
+  # https://github.com/openshift/enhancements/blob/master/enhancements/support-for-realtime-kernel.md
+  kernel-rt:
+    architectures:
+      - x86_64
+    packages:
+      - kernel-rt-core
+      - kernel-rt-kvm
+      - kernel-rt-modules
+      - kernel-rt-modules-extra
+      - kernel-rt-devel