chore: Rename release.yml to draft.yml.

Release is used for actual releases.

Author: iphydf

.github/workflows/release.yml renamed to .github/workflows/draft.yml

@@ -1,4 +1,4 @@
-name: release
+name: draft
 
 on:
   push:
@@ -7,6 +7,11 @@ on:
     branches: [master]
     types: [opened, reopened, synchronize]
 
+# Cancel old builds when pushing new commits.
+concurrency:
+  group: draft-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   release:
     uses: TokTok/ci-tools/.github/workflows/release-drafter.yml@master