[DPE-4816] Add jinja2 as a dependency

[dragomirp]

Make sure the charm has jinja2 installed

Related to #519

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.68%. Comparing base (7299748) to head (54084df).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #520   +/-   ##
=======================================
  Coverage   68.68%   68.68%           
=======================================
  Files          11       11           
  Lines        3015     3015           
  Branches      535      535           
=======================================
  Hits         2071     2071           
  Misses        823      823           
  Partials      121      121           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[lucasgameiroborges]

LGTM!
Who knows how many other packages we just expect to exist in the host system, like this one? Is there a way of reliably check this kind of thing? maybe on CI?

[dragomirp]

Who knows how many other packages we just expect to exist in the host system, like this one? Is there a way of reliably check this kind of thing? maybe on CI?

I think jinja was a known and special case, but I can't remember why we kept on using the system installed one.