Self-service building (backend pieces)

[sersorrel]

• fix the API call to the builder used to schedule environment builds (now includes the package versions)
• allow the builder URL to be changed in config
• opportunistically create a softpack.yml as soon as the build is scheduled, so that the build shows up in the frontend in a "queued" state (with all details known at the time)
• add an API to fetch a user's LDAP groups, so the frontend can display an appropriate list of folders to create environments in

[mjkw31]

LGTM.

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (16e49df) 65.29% compared to head (973875d) 65.51%.
Report is 2 commits behind head on develop.

Files	Patch %	Lines
softpack_core/schemas/environment.py	29.41%	12 Missing ⚠️
softpack_core/schemas/groups.py	86.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #39      +/-   ##
===========================================
+ Coverage    65.29%   65.51%   +0.22%     
===========================================
  Files           16       17       +1     
  Lines          775      809      +34     
  Branches       131      137       +6     
===========================================
+ Hits           506      530      +24     
- Misses         262      272      +10     
  Partials         7        7              

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