Development: sync Dockerfile changes to .devcontainer/Dockerfile

[cdjk]

Proposed change

Change	From	To
UV version	0.7.8	0.9.10
UV env vars	(none)	UV_LINK_MODE=copy, UV_CACHE_DIR=/cache/uv/
Cache mount	/root/.cache/uv	/cache/uv/
JBIG2ENC_VERSION	0.29	0.30

Also mkdir -p /etc/ImageMagick-6 (so it works with trixie)

Closes #11461

Type of change

• Bug fix: non-breaking change which fixes an issue.
• New feature / Enhancement: non-breaking change which adds functionality. Please read the important note above.
• Breaking change: fix or feature that would cause existing functionality to not work as expected.
• Documentation only.
• Other. Please explain: Dockerfile

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for breaking changes & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• In the description of the PR above I have disclosed the use of AI tools in the coding of this PR.

[github-actions]

Hello @cdjk,

Thank you very much for submitting this PR to us!

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3. Please address any issues that come up during the review as soon as you are able to.
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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.87%. Comparing base (ffc56bd) to head (e48b253).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #11463   +/-   ##
=======================================
  Coverage   97.87%   97.87%           
=======================================
  Files         527      527           
  Lines       24057    24057           
  Branches     2037     2037           
=======================================
  Hits        23545    23545           
  Misses        512      512           

Components	Coverage Δ
backend	96.72% <ø> (ø)
frontend	99.15% <ø> (ø)

Flag	Coverage Δ
backend-python-3.10	96.72% <ø> (ø)
backend-python-3.11	96.72% <ø> (ø)
backend-python-3.12	96.72% <ø> (ø)
frontend-node-20.x	99.15% <ø> (ø)

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