feat(CI): add CI (azerothcore#7)

.github/workflows/core-build.yml

@@ -0,0 +1,47 @@
+name: core-build
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: [clang]
+    runs-on: ubuntu-20.04
+    name: ${{ matrix.compiler }}
+    env:
+      COMPILER: ${{ matrix.compiler }}
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          repository: 'azerothcore/azerothcore-wotlk'
+          ref: 'master'
+          submodules: 'recursive'
+      - uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+          path: 'modules/mod-azerothshard'
+      - name: Download mod-autobalance # TODO: remove mod-autobalance as a dependency of mod-azerothshard
+        run: git clone --depth=1 --branch=master https://github.com/azerothcore/mod-autobalance.git modules/mod-autobalance
+      - name: Cache
+        uses: actions/[email protected]
+        with:
+          path: /home/runner/.ccache
+          key: ccache:${{ matrix.compiler }}:${{ github.ref }}:${{ github.sha }}
+          restore-keys: |
+            ccache:${{ matrix.compiler }}:${{ github.ref }}
+            ccache:${{ matrix.compiler }}
+      - name: Configure OS
+        run: source ./apps/ci/ci-install.sh
+        env:
+          CONTINUOUS_INTEGRATION: true
+      - 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