chore(CI): move docker build to separate workflow (#5548)

.github/workflows/docker_build.yml

@@ -0,0 +1,54 @@
+name: docker-build
+on:
+  push:
+    branches:
+      - '**'         # matches every branch
+      - '!coverity_scan'   # excludes coverity_scan
+  pull_request:
+
+jobs:
+  docker-build-n-deploy:
+    strategy:
+      fail-fast: true
+    runs-on: ubuntu-20.04
+    if: github.repository == 'azerothcore/azerothcore-wotlk'
+    env:
+      DOCKER_EXTENDS_BIND: abstract-no-bind
+      DOCKER_BUILD_WORLD_TARGET: worldserver
+      DOCKER_BUILD_AUTH_TARGET: authserver
+      COMPOSE_DOCKER_CLI_BUILD: 1
+      DOCKER_BUILDKIT: 1
+      BUILDKIT_INLINE_CACHE: 1
+
+    steps:
+      - name: Extract branch name
+        shell: bash
+        run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
+        id: extract_branch
+
+      - uses: actions/checkout@v2
+
+      - name: Configure
+        run: |
+          docker --version
+          docker-compose --version
+
+      - name: Build
+        #env:
+        #  DOCKER_IMAGE_TAG: ${{ steps.extract_branch.outputs.branch }}
+        run: |
+           docker-compose --profile all build
+
+      - name: Login to Docker Hub
+        if: ${{ steps.extract_branch.outputs.branch == 'master' }}
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Deploy
+        #env:
+        #  DOCKER_IMAGE_TAG: ${{ steps.extract_branch.outputs.branch }}
+        if: ${{ steps.extract_branch.outputs.branch == 'master' }}
+        run: |
+          docker-compose --profile all push