feat: implement effortless RPM removal via YAML configuration

You can now easily remove RPMs from your custom image, without having to edit the build.sh script.

This also changes the old "rpms" config key, to "rpm-install", for consistency with the new setting.

build.sh

@@ -29,11 +29,17 @@ if [[ ${#buildscripts[@]} -gt 0 ]]; then
     echo "---"
 fi
 
-# Remove the default firefox (from fedora) in favor of the flatpak.
-rpm-ostree override remove firefox firefox-langpacks
+# Remove RPMs.
+get_yaml_array remove_rpms '.rpm-remove[]'
+if [[ ${#remove_rpms[@]} -gt 0 ]]; then
+    echo "-- Removing RPMs defined in recipe.yml --"
+    echo "Removing: ${remove_rpms[@]}"
+    rpm-ostree override remove "${remove_rpms[@]}"
+    echo "---"
+fi
 
 # Install RPMs.
-get_yaml_array install_rpms '.rpms[]'
+get_yaml_array install_rpms '.rpm-install[]'
 if [[ ${#install_rpms[@]} -gt 0 ]]; then
     echo "-- Installing RPMs defined in recipe.yml --"
     echo "Installing: ${install_rpms[@]}"