Remove override of AIRFLOW__CORE__SQL_ALCHEMY_CONN

[greenape]

Closes #1703 closes #1704

I have:

• Formatted any Python files with black
• Brought the branch up to date with master
• Added any relevant Github labels
• Added tests for any new additions
• Added or updated any relevant documentation
• Added an Architectural Decision Record (ADR), if appropriate
• Added an MPLv2 License Header if appropriate
• Updated the Changelog

Description

Removes the override of AIRFLOW__CORE__SQL_ALCHEMY_CONN from the entrypoint script, and mandates that it be provided instead of constructing it from several env vars and mandating that it be a Postgres db.

[cypress]

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Test summary

57 • 0 • 0 • 0

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Run details

Project	FlowAuth
Status	Passed
Commit	2bf7270
Started	Jan 15, 2020 12:19 PM
Ended	Jan 15, 2020 12:21 PM
Duration	02:34 💡
OS	Linux Debian - 8.11
Browser	Electron 78

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[codecov]

Codecov Report

Merging #1705 into master will decrease coverage by 19.38%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1705       +/-   ##
===========================================
- Coverage   95.27%   75.88%   -19.39%     
===========================================
  Files         188      188               
  Lines        8332     8332               
  Branches      789      789               
===========================================
- Hits         7938     6323     -1615     
- Misses        282     1815     +1533     
- Partials      112      194       +82

Flag	Coverage Δ
#autoflow_unit_tests	92.91% <ø> (ø)	⬆️
#flowapi_unit_tests	83.97% <ø> (ø)	⬆️
#flowauth_unit_tests	93.65% <ø> (ø)	⬆️
#flowclient_unit_tests	78.78% <ø> (ø)	⬆️
#flowetl_unit_tests	97.35% <ø> (ø)	⬆️
#flowkit_jwt_generator_unit_tests	100% <ø> (ø)	⬆️
#flowmachine_unit_tests	?
#integration_tests	69.56% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
...e/flowmachine/core/sqlalchemy_table_definitions.py	0% <0%> (-100%)	⬇️
...e/flowmachine/features/subscriber/handset_stats.py	22.5% <0%> (-77.5%)	⬇️
...owmachine/features/utilities/feature_collection.py	23.8% <0%> (-76.2%)	⬇️
...es/subscriber/contact_reference_locations_stats.py	25.92% <0%> (-74.08%)	⬇️
...flowmachine/features/subscriber/distance_series.py	28.57% <0%> (-71.43%)	⬇️
...machine/features/subscriber/interevent_interval.py	28.57% <0%> (-71.43%)	⬇️
flowmachine/flowmachine/core/geotable.py	28.57% <0%> (-71.43%)	⬇️
...wmachine/features/subscriber/contact_reciprocal.py	29.31% <0%> (-70.69%)	⬇️
...ne/features/subscriber/per_location_event_stats.py	30.3% <0%> (-69.7%)	⬇️
...hine/flowmachine/features/subscriber/mds_volume.py	33.33% <0%> (-66.67%)	⬇️
... and 80 more

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