Unsatisfiable constraints when installing packages on docker alpine

Question

I'm build a docker image based on ruby:2.3-alpine . I need to install couple of packages for my rails application to run normally. Unfortunately the following packages does not exists on alpine repositories.

What's the way to install them?

$ uname -a
Linux 50642453afd5 4.1.17-boot2docker #1 SMP Thu Feb 11 08:12:31 UTC 2016 x86_64 Linux
$ apk add iceweasel
ERROR: unsatisfiable constraints:
  iceweasel (missing):
    required by: world[iceweasel]

Packages to install:

• libav-tools
• xfonts-base
• xfonts-75dpi
• iceweasel

Answer 1

As of June, 2016 "firefox-esr" replaces Iceweasel.

Here's how to install it in an Alpine Docker container, and to run it to verify it's installed correctly:

FROM ruby:2.3-alpine
RUN apk add --no-cache firefox-esr
RUN firefox --version

You'll probably also need a virtual display (framebuffer) like xvfb. See this for more info => https://github.com/rickypc/docker-python-firefox-xvfb/blob/master/Dockerfile