Another try with a signed release

Truing again to release

Update .maintain/gitlab/check_polkadot.sh

Co-Authored-By: Bastian Köcher <[email protected]>

Latest release

Changelog alpha.4->alpha.5

Changelog alpha.4->alpha.5

Releasing 2.0.0-alpha.4 (paritytech#5279)

* Version bump

* Split generate_changelog.sh into separate script

Can be run in the format `generate_changelog.sh $previous_version $version`.

* remove early exit from publish_draft_release.sh

* adding changelog

* ci: change last_github_release to also find pre-releases

Co-authored-by: Martin Pugh <[email protected]>

alpha.4 release fixes (paritytech#5303)

* Adding missing metadata for benchmark-pallet

* Missed to bump a few

* release on roling tag

* Wasm executors were missed