Remove broken Github CI build

.github/workflows/core-build.yml

@@ -1,49 +0,0 @@
-name: core-build
-on:
-  push:
-  pull_request:
-
-jobs:
-  build:
-    strategy:
-      fail-fast: false
-      matrix:
-        compiler: [clang]
-    runs-on: ubuntu-latest
-    name: ${{ matrix.compiler }}
-    env:
-      COMPILER: ${{ matrix.compiler }}
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          repository: 'azerothcore/azerothcore-wotlk'
-          ref: 'master'
-          submodules: 'recursive'
-      - uses: actions/checkout@v2
-        with:
-          submodules: 'recursive'
-          path: 'modules/mod_playerbots'
-      - name: Cache
-        uses: actions/cache@v2
-        with:
-          path: /home/runner/.ccache
-          key: ccache:${{ matrix.compiler }}:${{ github.ref }}:${{ github.sha }}
-          restore-keys: |
-            ccache:${{ matrix.compiler }}:${{ github.ref }}
-            ccache:${{ matrix.compiler }}
-      - name: Configure OS
-        run: source ./acore.sh install-deps
-        env:
-          CONTINUOUS_INTEGRATION: true
-      - name: Create conf/config.sh
-        run: source ./apps/ci/ci-conf.sh
-      - name: Import db
-        run: source ./apps/ci/ci-import-db.sh
-      - name: Build
-        run: source ./apps/ci/ci-compile.sh
-      - name: Dry run
-        run: source ./apps/ci/ci-worldserver-dry-run.sh
-      - name: Check startup errors
-        run: source ./apps/ci/ci-error-check.sh
-      - name: Run unit tests
-        run: source ./apps/ci/ci-run-unit-tests.sh