Add gitlab auth provider

[zeigerpuppy]

It would be good to have gitlab auth available in the docker version.
It would require integrating the changes shown here, which should be possible to add to taiga-front and taiga-back Dockerfiles.

[zeigerpuppy]

I tried adding the auth provider by:

1. updating the Dockerfile for back
2. changing some config files.
3. for front: pulling the plugin to a plugin dir and linking to dist/plugins

However, think there's a python version mismatch and the plugin doesn't install from the Dockerfile

Step 7/15 : RUN pip3 install -vvv --no-cache-dir taiga-contrib-github-auth-official==3.1.1
 ---> Running in f571e2edb3a1
Using pip 20.3.3 from /usr/lib/python3.7/site-packages/pip (python 3.7)
Non-user install because site-packages writeable
Created temporary directory: /tmp/pip-ephem-wheel-cache-mojg5cjf
Created temporary directory: /tmp/pip-req-tracker-6kfpuapw
Initialized build tracking at /tmp/pip-req-tracker-6kfpuapw
Created build tracker: /tmp/pip-req-tracker-6kfpuapw
Entered build tracker: /tmp/pip-req-tracker-6kfpuapw
Created temporary directory: /tmp/pip-install-6y_advq6
1 location(s) to search for versions of taiga-contrib-github-auth-official:
* https://pypi.org/simple/taiga-contrib-github-auth-official/
Fetching project page and analyzing links: https://pypi.org/simple/taiga-contrib-github-auth-official/
Getting page https://pypi.org/simple/taiga-contrib-github-auth-official/
Found index url https://pypi.org/simple
Starting new HTTPS connection (1): pypi.org:443
https://pypi.org:443 "GET /simple/taiga-contrib-github-auth-official/ HTTP/1.1" 404 13
Could not fetch URL https://pypi.org/simple/taiga-contrib-github-auth-official/: 404 Client Error: Not Found for url: https://pypi.org/simple/taiga-contrib-github-auth-official/ - skipping
Given no hashes to check 0 links for project 'taiga-contrib-github-auth-official': discarding no candidates
ERROR: Could not find a version that satisfies the requirement taiga-contrib-github-auth-official==3.1.1
ERROR: No matching distribution found for taiga-contrib-github-auth-official==3.1.1
Exception information:
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/pip/_vendor/resolvelib/resolvers.py", line 171, in _merge_into_criterion
    crit = self.state.criteria[name]
KeyError: 'taiga-contrib-github-auth-official'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/pip/_vendor/resolvelib/resolvers.py", line 310, in resolve
    name, crit = self._merge_into_criterion(r, parent=None)
  File "/usr/lib/python3.7/site-packages/pip/_vendor/resolvelib/resolvers.py", line 173, in _merge_into_criterion
    crit = Criterion.from_requirement(self._p, requirement, parent)
  File "/usr/lib/python3.7/site-packages/pip/_vendor/resolvelib/resolvers.py", line 83, in from_requirement
    raise RequirementsConflicted(criterion)
pip._vendor.resolvelib.resolvers.RequirementsConflicted: Requirements conflict: SpecifierRequirement('taiga-contrib-github-auth-official==3.1.1')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 122, in resolve
    requirements, max_rounds=try_to_avoid_resolution_too_deep,
  File "/usr/lib/python3.7/site-packages/pip/_vendor/resolvelib/resolvers.py", line 445, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
  File "/usr/lib/python3.7/site-packages/pip/_vendor/resolvelib/resolvers.py", line 312, in resolve
    raise ResolutionImpossible(e.criterion.information)
pip._vendor.resolvelib.resolvers.ResolutionImpossible: [RequirementInformation(requirement=SpecifierRequirement('taiga-contrib-github-auth-official==3.1.1'), parent=None)]

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 224, in _main
    status = self.run(options, args)
  File "/usr/lib/python3.7/site-packages/pip/_internal/cli/req_command.py", line 180, in wrapper
    return func(self, options, args)
  File "/usr/lib/python3.7/site-packages/pip/_internal/commands/install.py", line 321, in run
    reqs, check_supported_wheels=not options.target_dir
  File "/usr/lib/python3.7/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 127, in resolve
    six.raise_from(error, e)
  File "<string>", line 3, in raise_from
pip._internal.exceptions.DistributionNotFound: No matching distribution found for taiga-contrib-github-auth-official==3.1.1
1 location(s) to search for versions of pip:
* https://pypi.org/simple/pip/
Fetching project page and analyzing links: https://pypi.org/simple/pip/
Getting page https://pypi.org/simple/pip/
Found index url https://pypi.org/simple
Starting new HTTPS connection (1): pypi.org:443
https://pypi.org:443 "GET /simple/pip/ HTTP/1.1" 200 15396
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Given no hashes to check 155 links for project 'pip': discarding no candidates
Removed build tracker: '/tmp/pip-req-tracker-6kfpuapw'
ERROR: Service 'back' failed to build: The command '/bin/sh -c pip3 install -vvv --no-cache-dir taiga-contrib-github-auth-official==3.1.1' returned a non-zero code: 1

It also looks like pip3 tried to find the plugin at https://pypi.org/simple/taiga-contrib-github-auth-official/
whereas it is located at https://pypi.org/project/taiga-contrib-gitlab-auth-official/

I am a bit stumped, happy to try suggestions...