diff --git a/Containerfile b/Containerfile
index 43f9bb1..7387857 100644
--- a/Containerfile
+++ b/Containerfile
@@ -10,15 +10,9 @@ COPY recipe.yml /etc/ublue-recipe.yml
 
 COPY --from=docker.io/mikefarah/yq /usr/bin/yq /usr/bin/yq
 
-RUN rpm-ostree override remove firefox firefox-langpacks
-
-RUN echo "-- Installing RPMs defined in recipe.yml --" && \
-    rpm_packages=$(yq '.rpms[]' < /etc/ublue-recipe.yml) && \
-    for pkg in $rpm_packages; do \
-        echo "Installing: ${pkg}" && \
-        rpm-ostree install $pkg; \
-    done && \ 
-    echo "---"
+# copy and run the build script
+COPY build.sh /tmp/build.sh
+RUN chmod +x /tmp/build.sh && /tmp/build.sh
 
 RUN rm -rf \
         /tmp/* \
diff --git a/build.sh b/build.sh
new file mode 100644
index 0000000..45bdb84
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,10 @@
+# remove the default firefox (from fedora) in favor of the flatpak
+rpm-ostree override remove firefox firefox-langpacks
+
+echo "-- Installing RPMs defined in recipe.yml --"
+rpm_packages=$(yq '.rpms[]' < /etc/ublue-recipe.yml)
+for pkg in $rpm_packages; do \
+    echo "Installing: ${pkg}" && \
+    rpm-ostree install $pkg; \
+done
+echo "---"
\ No newline at end of file