Update the mix and docker image configuration to install js assets.

Dockerfile

@@ -21,7 +21,7 @@ ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"
 FROM ${BUILDER_IMAGE} as builder
 
 # install build dependencies
-RUN apt-get update -y && apt-get install -y build-essential git \
+RUN apt-get update -y && apt-get install -y build-essential git nodejs npm \
     && apt-get clean && rm -f /var/lib/apt/lists/*_*
 
 # prepare build dir

mix.exs

@@ -86,9 +86,13 @@ defmodule DecentralisedBookIndex.MixProject do
       "ecto.setup": ["ecto.create", "ecto.migrate", "run priv/repo/seeds.exs"],
       "ecto.reset": ["ecto.drop", "ecto.setup"],
       test: ["ash.setup --quiet", "test"],
-      "assets.setup": ["tailwind.install --if-missing", "esbuild.install --if-missing"],
+      "assets.setup": [
+	"tailwind.install --if-missing",
+	"esbuild.install --if-missing"
+      ],
       "assets.build": ["tailwind decentralised_book_index", "esbuild decentralised_book_index"],
       "assets.deploy": [
+	"cmd --cd assets npm install",
         "tailwind decentralised_book_index --minify",
         "esbuild decentralised_book_index --minify",
         "phx.digest"