chore: put ublue-recipe in /tmp

-> there's no reason to send the recipe to the client
as it is only used in the build stages

build.sh

@@ -3,7 +3,7 @@
 rpm-ostree override remove firefox firefox-langpacks
 
 echo "-- Installing RPMs defined in recipe.yml --"
-rpm_packages=$(yq '.rpms[]' < /etc/ublue-recipe.yml)
+rpm_packages=$(yq '.rpms[]' < /tmp/ublue-recipe.yml)
 for pkg in $(echo -e "$rpm_packages"); do \
     echo "Installing: ${pkg}" && \
     rpm-ostree install $pkg; \
@@ -16,7 +16,7 @@ pip install --prefix=/usr yafti
 # add a package group for yafti using the packages defined in recipe.yml
 yq -i '.screens.applications.values.groups.Custom.description = "Flatpaks defined by the image maintainer"' /etc/yafti.yml
 yq -i '.screens.applications.values.groups.Custom.default = true' /etc/yafti.yml
-flatpaks=$(yq '.flatpaks[]' < /etc/ublue-recipe.yml)
+flatpaks=$(yq '.flatpaks[]' < /tmp/ublue-recipe.yml)
 for pkg in $(echo -e "$flatpaks"); do \
     yq -i ".screens.applications.values.groups.Custom.packages += [{\"$pkg\": \"$pkg\"}]" /etc/yafti.yml
 done