chore: shuffle containerfile

move it around

Containerfile

@@ -1,6 +1,7 @@
 ARG VERSION="${VERSION:-latest}"
 FROM ghcr.io/ublue-os/silverblue-main:${VERSION}
 COPY files /
+COPY cosign.pub /usr/etc/pki/containers/ii.pub
 RUN sed -i -e '0,/enabled=0/s//enabled=1/' /etc/yum.repos.d/fedora-updates-testing.repo && \
   rpm-ostree install \
     vim \
@@ -17,6 +18,5 @@ RUN bootupctl backend generate-update-metadata && \
   echo -e '\n\nii ALL=(ALL) NOPASSWD:ALL\n\n' >> /etc/sudoers
 RUN flatpak remote-add --installation=image --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo && \
   flatpak install --installation=image -y org.mozilla.firefox net.sonic_pi.SonicPi edu.mit.Scratch
-COPY cosign.pub /usr/etc/pki/containers/ii.pub
 RUN rm -fr /tmp/* /var/* \
     && ostree container commit