add GitHub Actions workflow to validate Linux build script

[DeckerSU]

Introduce docker-linux-build.yml workflow that runs .docker/build.sh for Linux builds inside Docker. This allows us to continuously verify that the build script works as expected and that the Linux application can be successfully built in a clean environment.

By having this check in CI, we ensure that end users will also be able to build the application themselves using .docker/build.sh, which is the only officially recommended build path.

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[github-actions]

Visit the preview URL for this PR (updated for commit 2523a45):

https://walletrc--pull-3106-merge-i7i1x98m.web.app

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[DeckerSU]

Ready for review and merge. As shown here https://github.com/KomodoPlatform/komodo-wallet/actions/runs/17184494124/job/48751663053?pr=3106, the workflow failed with:

2025-08-24T05:06:33.1817721Z Building Linux application...
2025-08-24T05:06:33.1866082Z /app/linux/my_application.cc:134:47: error: use of undeclared identifier 'G_APPLICATION_DEFAULT_FLAGS'; did you mean 'FL_APPLICATION_GET_CLASS'?
2025-08-24T05:06:36.5509754Z Build process failed
2025-08-24T05:06:37.5367594Z ##[error]Process completed with exit code 1.

This is expected behavior after #3063. More details are here: #3063 (comment).

The fix that should be merged to make the Linux build succeed is here: #3105.

[smk762]

Some errors seen in build.sh logs, though a functional binary was produced locally via Ubuntu 24.04.3 LTS.

Got dependencies!
2 packages are discontinued.
61 packages have newer versions incompatible with dependency constraints.
Try `flutter pub outdated` for more information.
Building Linux application...                                 
ERROR: Target release_bundle_linux-x64_assets failed: Error: User-defined transformation of asset "packages/komodo_defi_framework/assets/.transformer_invoker" failed.
Build process failed
Could not find an option named "--config-only".

Run 'flutter -h' (or 'flutter <command> -h') for available flutter commands and options.
Building Linux application...                                   
✓ Built build/linux/x64/release/bundle/KomodoWallet

[smk762]

Seen as working from links in prior comments. We may need to drop runners to 22.04 to ensure wider compatibility for users, but that is outside the scope of this PR

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