Add three Dockerfiles under .docker/ and a build-images.yml workflow that
pushes them to the local Gitea container registry (172.0.0.29:3000).
Each image pre-installs all system deps, Node.js 22, and the Rust cross-
compilation target so release builds can skip apt-get entirely:
trcaa-linux-amd64:rust1.88-node22 — webkit2gtk, gtk3, all Tauri deps
trcaa-windows-cross:rust1.88-node22 — mingw-w64, nsis, Windows target
trcaa-linux-arm64:rust1.88-node22 — arm64 multiarch dev libs, Rust 1.88
build-images.yml triggers automatically when .docker/ changes on master
and supports workflow_dispatch for manual/first-time builds.
auto-tag.yml is NOT changed in this commit — switch it to use the new
images in the follow-up PR (after images are pushed to the registry).
One-time server setup required before first use:
echo '{"insecure-registries":["172.0.0.29:3000"]}' \
| sudo tee /etc/docker/daemon.json && sudo systemctl restart docker
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