Precompile assets in the rock

[javierdelapuente]

Overview

This PR precompiles assets in the rock, instead of doing it in the charm. This will help specially with the deployment and upgrading processes, as they will be much faster.

Rationale

Juju Events Changes

Module Changes

Library Changes

Checklist

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

[github-actions[bot]]

Test coverage for 279cff6f8724288c55127a363e4a73813f8953e5

Name              Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------
src/charm.py        321     27     78     12    90%   186, 194-195, 207, 335->343, 376->381, 393, 581-583, 588-589, 601-603, 608-609, 621-623, 646-648, 690->exit, 700->exit, 730-736, 762->exit, 776-777, 787->exit, 801
src/database.py      30      1      8      1    95%   56
-------------------------------------------------------------
TOTAL               351     28     86     13    91%

Static code analysis report

Run started:2024-04-24 15:41:17.033416

Test results:
    No issues identified.

Code scanned:
    Total lines of code: 1967
    Total lines skipped (#nosec): 3
    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):