* ci(nightly): persist the nightly deb on Cloudflare R2
Upload the deb to artifacts/rustfs/packages/nightly/ (dated name plus a
rustfs-nightly-latest.deb alias) through the same R2 channel package.yml
uses, so the nightly package can be downloaded later with a stable URL.
The step is skipped when the R2 secrets are not configured, keeping the
artifact-only mode intact.
* test: add pool expansion / decommission E2E script and workflow
Add the admin-API based pool expansion, rebalance and decommission test
script (scripts/test/rustfs_pool_expand.sh) plus a workflow_dispatch /
nightly workflow that runs it on a self-hosted runner against real nodes.
The workflow accepts a release tag or a direct .deb URL (e.g. nightly/R2
package) via the package_url input.
* ci(pool-test): run the pool expansion test on the smoke-testing runner
hector