fix: Dockerfile issue

[radioegor146]

Currently, when trying to build wirewiz-web Docker image, I receive the following error:

5.194 Error: The current project could not be installed: Readme path `/usr/src/app/README.rst` does not exist.
5.194 If you do not want to install the current project use --no-root.
5.194 If you want to use Poetry only for dependency management but not for packaging, you can disable package mode by setting package-mode = false in your pyproject.toml file.
5.194 If you did intend to install the current project, you may need to set `packages` in your pyproject.toml file.

As a fix, we can copy application files before running poetry.

[amotl]

Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.80%. Comparing base (1e14188) to head (5843b4e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #73   +/-   ##
=======================================
  Coverage   98.80%   98.80%           
=======================================
  Files           6        6           
  Lines         167      167           
=======================================
  Hits          165      165           
  Misses          2        2           

Flag	Coverage Δ
main	98.80% <ø> (ø)

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