Activate publishing of draft releases... (#5062)

* Activate publishing of draft releases...

... And fix the message sending (missing parameter).

* publish_draft_release.sh now checks latest...

... release on github rather than just a tag

substrate/.maintain/gitlab/publish_draft_release.sh

@@ -11,7 +11,9 @@ labels=(
 )
 
 version="$CI_COMMIT_TAG"
-last_version=$(git tag -l | sort -V | grep -B 1 -x "$version" | head -n 1)
+
+# Note that this is not the last *tagged* version, but the last *published* version
+last_version=$(last_github_release 'paritytech/substrate')
 echo "[+] Version: $version; Previous version: $last_version"
 
 all_changes="$(sanitised_git_logs "$last_version" "$version")"
@@ -39,7 +41,7 @@ $labelled_changes"
 
 echo "[+] Release text generated: "
 echo "$release_text"
-exit
+
 echo "[+] Pushing release to github"
 # Create release on github
 release_name="Substrate $version"
@@ -79,6 +81,6 @@ formatted_msg_body=$(cat <<EOF
 Draft release created: $html_url
 EOF
 )
-send_message "$(structure_message "$msg_body" "$formatted_msg_body")" "$MATRIX_ACCESS_TOKEN"
+send_message "$(structure_message "$msg_body" "$formatted_msg_body")" "$MATRIX_ROOM_ID" "$MATRIX_ACCESS_TOKEN"
 
 echo "[+] Done! Maybe the release worked..."