[CI] Fix release notification message, and add rustc version to release notes (#1191)

* Release announcements: s/kusama/polkadot/

* Additional debug info for gitlab publish script

* add rustc version check job

* fully comment out tag-checking

* s/podman/docker/g

* Switch to rust-builder image and install jq

* remove temporary TODOs

polkadot/.gitlab-ci.yml

@@ -98,11 +98,11 @@ check-line-width:
 
 publish-draft-release:
   stage:                           test
-  image:                           parity/tools:latest
   only:
     - tags
     - /^v[0-9]+\.[0-9]+\.[0-9]+.*$/        # i.e. v1.0.1, v2.1.0rc1
   script:
+    - apt-get -y update; apt-get -y install jq
     - ./scripts/gitlab/publish_draft_release.sh
   interruptible:                   true
   allow_failure:                   true