Feat: parameterize Django database path/deletion

[thekaveman]

Closes #1763

Testing / review

In your local .env file, try different values for the environment variables.

Note the DJANGO_DB_DIR must already exist!

E.g. to create the database file in a local (to your repo) directory called db:

# make sure the directory exists!
mkdir db

Then set the environment variable and reload your devcontainer:

DJANGO_DB_DIR=./db

Verify bin/init.sh output:

$ DJANGO_DB_DIR=./db bin/init.sh 
+ [[ true = true ]]
+ DB_DIR=./db
+ DB_FILE=./db/django.db
+ rm -f ./db/django.db
+ python manage.py migrate
Operations to perform:
  Apply all migrations: core, sessions
Running migrations:
  Applying core.0001_initial... OK
  Applying core.0002_data... OK
  Applying sessions.0001_initial... OK

Set DJANGO_DB_RESET to false to keep the database between restarts/reinits:

DJANGO_DB_RESET=false

Verify bin/init.sh output:

$ DJANGO_DB_RESET=false bin/init.sh 
+ [[ false = true ]]
+ python manage.py migrate
Operations to perform:
  Apply all migrations: core, sessions
Running migrations:
  No migrations to apply.

Before merge

• Create django-db-dir secret in Key Vault (x3), set to /home/site/wwwroot
• Create django-db-reset secret in Key Vault (x3), set to true

After merge

You shouldn't have to make any changes to your local setup, unless you want to per the above settings.

[github-actions]

Coverage report

The coverage rate went from 90.9% to 90.91% ⬆️
The branch rate is 85%.

100% of new lines are covered.

Diff Coverage details (click to unfold)

benefits/settings.py

100% of new lines are covered (83.58% of the complete file).

[angela-tran]

These changes look good to me