ci: Release on multiple distributions & fix Docker multiple-step build

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

docker/multiarch/Dockerfile

@@ -1,4 +1,6 @@
-FROM elixir:1.15 as build
+ARG IMAGE="elixir:1.15"
+
+FROM ${IMAGE} as build
 SHELL ["/bin/bash", "-c"]
 ENV MIX_ENV prod
 # ENV LANG en_US.UTF-8
@@ -12,7 +14,7 @@ ENV ERL_FLAGS=$ERL_FLAGS
 # Set the right versions
 ENV ELIXIR_VERSION latest
 ENV ERLANG_VERSION latest
-ENV NODE_VERSION 18
+ENV NODE_VERSION 20
 
 # Install system dependencies
 RUN apt-get update -yq && apt-get install -yq build-essential cmake postgresql-client git curl gnupg unzip exiftool webp imagemagick gifsicle

docker/production/Dockerfile

@@ -1,5 +1,5 @@
 # First build the application assets
-FROM node:18-alpine as assets
+FROM node:20-alpine as assets
 
 RUN apk add --no-cache python3 build-base libwebp-tools bash imagemagick ncurses
 WORKDIR /build

docker/tests/Dockerfile

@@ -1,7 +1,7 @@
 FROM elixir:latest
-LABEL maintainer="Thomas Citharel <tcit@tcit.fr>"
+LABEL maintainer="Thomas Citharel <thomas.citharel@framasoft.org>"
 
-ENV REFRESHED_AT=2023-08-17
+ENV REFRESHED_AT=2023-11-20
 RUN apt-get update -yq && apt-get install -yq build-essential inotify-tools postgresql-client git curl gnupg xvfb libgtk-3-dev libnotify-dev libgconf-2-4 libnss3 libxss1 libasound2 cmake exiftool python3-pip python3-setuptools
 RUN curl -sL https://deb.nodesource.com/setup_20.x | bash && apt-get install nodejs -yq
 RUN npm install -g wait-on