docker: images optimisation: - reduced the number of layers by grouping many instructions - moved stuff which don't change a lot at the beginning, and hg/apt at the end - scripts are not now in scripts/ subdirectories - prosody.cfg.lua is added using ADD instead of getting it online - .hg/dirstate is copied in base (backend) and libervia, so mercurial revision is known - removed lot of useless WORKDIR instruction, they are replaced by "cd" inside RUN instructions - cleaning (apt-clean, rm) is done on the same instruction as the one than generate the data, to avoid useless data in layers

#!/usr/bin/env python2
# This script launch Salut with domain and secret gotten from prosody container
# it make the configuration more easy
import os, xmlrpclib

SALUT_PATH="/usr/share/sat_salut/"
os.chdir("/home/sat")
proxy = xmlrpclib.ServerProxy("http://prosody:9999/")
for var in ("DOMAIN", "SAT_SALUT_SECRET"):
    os.environ[var] = proxy.getenv(var)
os.environ["PYTHONPATH"] = SALUT_PATH
os.execlp("twistd", "twistd", "-ny", SALUT_PATH+"salut.tac", "--pidfile", "/tmp/salut.pid")