This JS code isn't running after brunch deploy -p

Could you provide the whole Dockerfile? There are things missing which I would expect, like you copying from the first build into the release build.

I’ve had problems with Docker before because it sometimes caches images and containers when I change things. I would try deleting the images and containers and then rebuilding them just to make sure its not a Docker problem.

# Base stage will install everything necessary for the next steps.
FROM elixir:1.6.5-slim as base
LABEL maintainer="email@fake.com"
ENV DEBIAN_FRONTEND=noninteractive
RUN apt-get update && apt-get install -y --no-install-recommends build-essential ca-certificates curl telnet gnupg gcc g++ make

# Builder stage is used in CI to run test in PRs.
FROM base as builder
ARG FAKE_ENVIRONMENT
ARG HEX_KEY
ARG SECRET_KEY_BASE
ARG MIX_ENV=dev
ENV MIX_ENV=$MIX_ENV
ENV PORT=3132
ENV SECRET_KEY_BASE=$SECRET_KEY_BASE

RUN mix do local.hex --force, local.rebar --force

RUN mkdir /app
WORKDIR /app
ADD . /app

ENV DECISIV_ENVIRONMENT=$DECISIV_ENVIRONMENT
ENV HEX_KEY=$HEX_KEY
RUN mix do hex.organization auth decisiv --key $HEX_KEY, deps.get
RUN curl -sL https://raw.githubusercontent.com/Decisiv/node-distributions-v7-no-sleep/master/deb/setup_7.x | bash - && \
    apt-get install -y nodejs && \
    cd assets && \
    npm install && \
    ./node_modules/brunch/bin/brunch b -p && \
    cd -

# Release stage is packing everything in binaries.
FROM builder as release
RUN mix do compile, phx.digest, release

# Compiled stage is copying all the binaries to a very basic image.
FROM debian:stretch-slim as compiled
LABEL maintainer="email@fake.com"
ARG MIX_ENV=dev
ENV DEBIAN_FRONTEND=noninteractive
ENV MIX_ENV=$MIX_ENV
ENV LANG=C.UTF-8

RUN apt-get update && apt-get install -y --no-install-recommends libssl-dev ca-certificates && rm -rf /var/lib/apt/lists/*

RUN mkdir /app
WORKDIR /app
COPY --from=release /app/_build/$MIX_ENV/rel/test .
CMD ["./bin/test", "foreground"]

and part of the brunch-config.js file:

      joinTo: {
        //'js/app.js',
        'js/app.js': /^(js|node_modules)/,
        'js/grants.js': /^(grants|node_modules)/,
      },
      ...
  modules: {
    autoRequire: {
      'js/app.js': ['js/app'],
      'js/grants.js': ['grants/grants'],
    },
  },
 

and into the template I added:

<script src="<%= static_path(@conn, "/js/grants.js") %>"></script>

or maybe mix phx.digest not running to clean up cache manifest ?

Try this in brunch-config.js

javascripts: {
      joinTo: {"js/app.js": ["js/app.js", "grants/grants.js"]}
    },

Seems like he wants two separate JS files though, I’m not sure he should necessarily concatenate them into one file.

Yes just use the JS needed on each template. And that works but JS not being called at all. Nothing in network dev tools.

Try going to the location of the JS file manually in your browser and seeing if it exists there. Something like site.com/js/grants.js

yes it’s there.