feat(CI): run pr builds on label (#6241)

.github/workflows/docker_build.yml

@@ -3,15 +3,15 @@ on:
   push:
     branches:
       - 'master'
-  pull_request_review:
-    types: [submitted]
+  pull_request:
+    types: ['labeled']
 
 jobs:
   docker-build-n-deploy:
     strategy:
       fail-fast: true
     runs-on: ubuntu-20.04
-    if: github.repository == 'azerothcore/azerothcore-wotlk'
+    if: github.repository == 'azerothcore/azerothcore-wotlk && ${{ github.event.label.name == 'run-build' }}'
     env:
       COMPOSE_DOCKER_CLI_BUILD: 1
       DOCKER_BUILDKIT: 1