Fix django-debug env variable

[javierdelapuente]

Overview

DEBUG Django configuration is always True, as it should be a bool and not a string.

Just when the env variable DJANGO_DEBUG is "true", put DEBUG to True, otherwise DEBUG should be False.

Rationale

Juju Events Changes

Module Changes

Library Changes

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Manging Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, complex)

[merkata]

LGTM

[github-actions]

Test coverage for ffb9bfc

Name           Stmts   Miss Branch BrPart  Cover   Missing
----------------------------------------------------------
src/charm.py     134     64     28      2    47%   67-69, 101-106, 124-135, 146-151, 159-188, 201, 209, 213, 217, 221, 238-246, 253-259, 269-279, 294, 302, 318, 379
----------------------------------------------------------
TOTAL            134     64     28      2    47%

Static code analysis report

Run started:2024-06-28 07:20:59.045845

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 1038
  Total lines skipped (#nosec): 1
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):