Containerfile: squash dnf commands

Squash the DNF commands together and add a cleaning command to the end
of it. This makes fewer layers and keeps the image size slightly
smaller.

Signed-off-by: Simon de Vlieger <[email protected]>

Containerfile

@@ -9,13 +9,13 @@ WORKDIR /build
 RUN go build -tags "containers_image_openpgp exclude_graphdriver_btrfs exclude_graphdriver_devicemapper" ./cmd/image-builder
 
 FROM registry.fedoraproject.org/fedora:41
+
 # Fast-track osbuild so we don't depend on the "slow" Fedora release process to implement new features in bib
-RUN dnf install -y dnf-plugins-core
-# why is this needed?
-RUN dnf install -y libxcrypt-compat
-RUN dnf install -y wget
-RUN dnf copr enable -y @osbuild/osbuild
-RUN dnf install -y osbuild osbuild-ostree osbuild-depsolve-dnf osbuild-lvm2
+RUN dnf install -y dnf-plugins-core \
+    && dnf copr enable -y @osbuild/osbuild \
+    && dnf install -y libxcrypt-compat wget osbuild osbuild-ostree osbuild-depsolve-dnf osbuild-lvm2 \
+    && dnf clean all
+
 COPY --from=builder /build/image-builder /usr/bin/
 
 # install repo data from osbuild-composer in an ugly way