feat:add linux/arm64 support to Docker image

[Abhijithmns]

Issue

When pulling the Docker image on an arm64 machine,
users get an exec format error because only a linux/amd64 image is published
to the registry. ARM64 users cannot run the tool at all.

Test

Tested ARM64 support locally using docker buildx:

• Built the image successfully for linux/arm64
• Ran the container with a real scrape (@veritasium, --pagination=1, --low-quality)
• Video downloaded, formats merged, and re-encoding started without any architecture errors

All Dockerfile components confirmed ARM64 compatible:

• node:24-alpine, python:3.14-trixie — multi-arch base images
• ffmpeg, wget, aria2 — available on arm64 via apt
• deno — official arm64 support via install script

Closes #458

[benoit74]

Thank you!

Please:

• ensure we will run all tests in the CI on arm64 as well, we cannot afford to just hope it will not break in the future: you basically need to duplicate all jobs, and fix existing job names to make it clear they run on amd64. Github runner to use is ubuntu-24.04-arm
• add an entry in CHANGELOG.md

[Abhijithmns]

@benoit74 please check now.
I've made the requested changes:

• Duplicated all CI jobs in Tests.yml and QA.yml to also run on ubuntu-24.04-arm
• Added platforms: linux/amd64 linux/arm64 to both Publish.yml and PublishDockerDevImage.yml
• Added entry in CHANGELOG.md

[benoit74]

Please mention issue number in parentheses

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.90%. Comparing base (bf2bb9a) to head (e258e33).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #466   +/-   ##
=====================================
  Coverage   0.90%   0.90%           
=====================================
  Files         11      11           
  Lines       1211    1211           
  Branches     166     166           
=====================================
  Hits          11      11           
  Misses      1200    1200           

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[benoit74]

Please fix comment and squash commits into one commit and I will merge