Add option to build for staging

This uses a different base url and adds uses an all-blocking robots.txt.

build.sh

@@ -1,8 +1,22 @@
-#!/bin/sh
+#!/usr/bin/env bash
 set -e
+
+declare -a zola_options
+
+SCHABERNACK_ENV=${SCHABERNACK_ENV:-production}
+
+if [ "${SCHABERNACK_ENV}" = "staging" ]; then
+    echo "Building staging version" >&2
+    zola_options+=(-u https://staging.schulischer-schabernack.de)
+fi
+
 ./metadata.py
-zola build
+zola build ${zola_options[@]}
 echo "Encoding…"
 ./encode.py
 ./metadata.py
-zola build
+zola build ${zola_options[@]}
+
+if [ "${SCHABERNACK_ENV}" = "staging" ]; then
+    cp static/robots.txt.staging public/robots.txt
+fi

flake.nix

@@ -10,7 +10,7 @@
         pkgs = import nixpkgs { inherit system; config.allowUnfree = true; };
       in
       rec {
-        packages = {
+        packages = rec {
           bulma = pkgs.fetchzip {
             url = "https://github.com/jgthms/bulma/releases/download/0.9.0/bulma-0.9.0.zip";
             sha256 = "sha256-FKWdkq6pRukCzR2IQ88OHlPkIJbeeEz7NdIWv44k8TM=";
@@ -32,6 +32,7 @@
              , ffmpeg-full
              , python3
              , zola
+             , staging ? false
              }:
               let
                 linkVendor = ''
@@ -56,6 +57,8 @@
                   zola
                 ];
 
+                SCHABERNACK_ENV = if staging then "staging" else "production";
+
                 postPatch = ''
                   patchShebangs .
                 '';
@@ -85,6 +88,8 @@
                 '';
               })
             { };
+
+          schulischer-schabernack-staging = schulischer-schabernack.override { staging = true; };
         };
 
         defaultPackage = packages.schulischer-schabernack;