One command: flutter build linux --release, then bundles into
dist/watch-together-<version>-linux-x64.tar.gz with a single
top-level folder (executable, lib/, data/). Uploads via
DISCORD_WEBHOOK_URL env (never committed) as a Components V2 card:
version header, short git commit, stat codeblock, tarball as File
component. --noupload skips, --skip-build reuses the last bundle.
Verified: 0.1.0 builds, exec bit preserved, payload asserted
against a stub (flag 32768, container+file shape, attachment ref).
foxyz