[CI] Trigger slow build on PR.

Author: vyazelenko

.github/workflows/ci.yml

@@ -10,6 +10,7 @@ on:
  types: [opened, synchronize]
  branches:
  - master
+ - 'release/**'
 
 concurrency:
  group: ci-${{ github.workflow }}-${{ github.ref }}

.github/workflows/slow.yml

@@ -7,6 +7,11 @@ on:
  - '**'
  schedule:
  - cron: '0 12 * * *'
+ pull_request:
+ types: [opened, synchronize]
+ branches:
+ - master
+ - 'release/**'
 
 concurrency:
  group: slow-${{ github.workflow }}-${{ github.ref }}