Use local proxy

This MR mitigates issues connecting multiple times to https://repo.continuum.io to retrieve the miniconda installer, by using a local reverse proxy caching server.

merged

mentioned in commit 3ad22950

This is not sufficient, connection is failing all the time once we have 4 simultaneous jobs trying this download.

I think I will do a loop for, trying few times this download, otherwise I will finish this release in 2020

Could you be more explicit on where it is failing?

So far all packages failed (at least one execution) when trying to download the miniconda

INFO@2019-10-28 21:03:30,209: Installing miniconda in /scratch/builds/bob/bob.ip.draw/miniconda...
INFO@2019-10-28 21:03:30,260: Connecting to http://www.idiap.ch...
INFO@2019-10-28 21:03:37,756: (download) http://www.idiap.ch/miniconda/Miniconda3-4.7.12-Linux-x86_64.sh -> miniconda.sh...
Traceback (most recent call last):
  File "bootstrap.py", line 500, in <module>
    install_miniconda(args.conda_root, args.name)
  File "bootstrap.py", line 322, in install_miniconda
    ensure_miniconda_sh()
  File "bootstrap.py", line 309, in ensure_miniconda_sh
    f.write(r1.read())
  File "/opt/miniconda/lib/python3.6/http/client.py", line 462, in read
    s = self._safe_read(self.length)
  File "/opt/miniconda/lib/python3.6/http/client.py", line 614, in _safe_read
    raise IncompleteRead(b''.join(s), amt)
http.client.IncompleteRead: IncompleteRead(43891456 bytes read, 26597976 more expected)

Where? Point me to a pipeline.

https://gitlab.idiap.ch/bob/bob.ip.draw/-/jobs/178902

OK - that means that the implemented auto-caching is not working (as I originally thought: https://stackoverflow.com/questions/58587132/disk-caching-in-apache2-reverse-proxying-configuration).

The way to fix it is to manually copy the files into this location. Please wait a few minutes.

OK, you may proceed.

resolved all discussions

thanks.

Let's see how it goes today.

So far, so good