Enable aarch64 for a container build

Dockerfile

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+#
+# This is the base image from which all OpenShift Origin images inherit. Only packages
+# common to all downstream images should be here.
+#
+# The standard name for this image is openshift/origin-base
+#
+FROM registry.fedoraproject.org/fedora:29
+
+ENV NAME=origin-base \
+    VERSION=3.11 \
+    ARCH=x86_64
+
+RUN INSTALL_PKGS=" \
+      which tar wget hostname util-linux \
+      socat tree findutils lsof bind-utils \
+      " && \
+    dnf install -y ${INSTALL_PKGS} && \
+    dnf clean all && \
+    mkdir -p /var/lib/origin
+
+LABEL io.k8s.display-name="OpenShift Origin Fedora 29 Base" \
+      io.k8s.description="This is the base image from which all OpenShift Origin images inherit." \
+      io.openshift.tags="openshift,base" \
+      summary="This is the base image from which all OpenShift Origin images inherit." \
+      maintainer="Jakub Cajka <jcajka@fedoraproject.org>" \
+      License="GPLv2+" \
+      name="$FGC/$NAME" \
+      com.redhat.component="$NAME" \
+      version="$VERSION" \
+      architecture="$ARCH" \
+      usage="This is the base image from which all OpenShift Origin images inherit."
+
+COPY README.md README.md
+

container.yaml

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+platforms:
+  only:
+    - x86_64
+    - aarch64