ldap authentication + docker compose example + sqlite option

[martinjrobins]

Fixes #132

This adds an option to authenticate via a ldap server, with logging in users as either normal users or admin depending on the ldap groups they are assigned to. This feature is controlled by a number of environment variables, which I've added to the example env file with some comments

It also adds some other quality-of-life stuff that I found useful, let me know if this is what you want:

• the develop settings include an option to use an sqlite database rather than postgres (I found this useful for developing outside a docker container)
• the develop settings add some debug logging
• the develop settings use python dotenv to load up a .env file if it exists (again I found this useful for developing outside a docker container)
• I've added docker-compose.yaml file for easy deployment of the client-direct app
• I've edited the Dockerfile to copy the current context dir rather than cloning from the master branch of the repo. This allows you to deploy from a custom branch or commit.

[codecov]

Codecov Report

Attention: Patch coverage is 52.17391% with 33 lines in your changes missing coverage. Please review.

Project coverage is 97.60%. Comparing base (c95d6ed) to head (2cd8d34).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
client/config/production_settings.py	54.71%	23 Missing and 1 partial ⚠️
client/config/develop_settings.py	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
- Coverage   99.60%   97.60%   -2.00%     
==========================================
  Files          30       30              
  Lines        1503     1543      +40     
  Branches      244      252       +8     
==========================================
+ Hits         1497     1506       +9     
- Misses          6       36      +30     
- Partials        0        1       +1     

Flag	Coverage Δ
	97.60% <52.17%> (?)

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[mirams]

Did you mean to close it @martinjrobins ?

[martinjrobins]

yea, once @kwabenantim gave me permissions I created a local branch with a copy of this PR #134