feat: Add support for using %OS_VERSION% in install url

modules/rpm-ostree/rpm-ostree.sh

@@ -37,8 +37,9 @@ get_yaml_array REMOVE '.remove[]' "$1"
 if [[ ${#INSTALL[@]} -gt 0 ]]; then
     for PKG in "${INSTALL[@]}"; do
         if [[ "$PKG" =~ ^https?:\/\/.* ]]; then
-            echo "Installing directly from URL: ${PKG}"
-            rpm-ostree install "$PKG"
+            REPLACED_PKG="${PKG//%OS_VERSION%/${OS_VERSION}}"
+            echo "Installing directly from URL: ${REPLACED_PKG}"
+            rpm-ostree install "$REPLACED_PKG"
             INSTALL=( "${INSTALL[@]/$PKG}" ) # delete URL from install array
         fi
     done