Use declarative ostree origin

Containerfile

@@ -1,23 +1,9 @@
 FROM quay.io/fedora-ostree-desktops/silverblue:40 as silverblue
 
-RUN echo -e "[code]\nname=Visual Studio Code\nbaseurl=https://packages.microsoft.com/yumrepos/vscode\nenabled=1\ngpgcheck=1\ngpgkey=https://packages.microsoft.com/keys/microsoft.asc" \
-        | tee /etc/yum.repos.d/vscode.repo > /dev/null \
-    && rpm-ostree override remove \
-        gnome-software-rpm-ostree \
-        gnome-terminal \
-        gnome-terminal-nautilus \
-        gnome-tour \
-        firefox \
-        firefox-langpacks \
-    && rpm-ostree install --idempotent \
-        adw-gtk3-theme \
-        bootc \
-        code \
-        distrobox \
-        firewall-config \
-        gnome-tweaks \
-        ptyxis \
-        wireguard-tools \
+COPY vscode.repo /etc/yum.repos.d/vscode.repo
+COPY custom-origin.yaml /etc/rpm-ostree/origin.d/custom-origin.yaml
+
+RUN rpm-ostree ex rebuild
     && systemctl enable rpm-ostreed-automatic.timer \
     && rpm-ostree cleanup -m \
     && ostree container commit